diff --git a/1000-hours/public/audios/zed-uk-female.mp3 b/1000-hours/public/audios/zed-uk-female.mp3
new file mode 100644
index 00000000..091e8357
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diff --git a/1000-hours/public/audios/zed-uk-male.mp3 b/1000-hours/public/audios/zed-uk-male.mp3
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diff --git a/1000-hours/sounds-of-american-english/1-basics.md b/1000-hours/sounds-of-american-english/1-basics.md
index 13435382..8e0529c5 100644
--- a/1000-hours/sounds-of-american-english/1-basics.md
+++ b/1000-hours/sounds-of-american-english/1-basics.md
@@ -2,8 +2,6 @@
 
 其实，所谓的 “基础” 真的很少，打印出来不过几页纸而已……
 
-竟然会有人问，“我零基础可不可以？” 
-
-—— 当然可以。
+经常有人问，“我零基础可不可以？” —— 当然可以。
 
 说实话，不仅可以，事实上可能相对还更好一些，因为零基础的人压根就没有那么多需要纠正的通过长期错误使用而形成的无数细节错误。
diff --git a/1000-hours/sounds-of-american-english/1.2-alphabets.md b/1000-hours/sounds-of-american-english/1.2-alphabets.md
index 66dfb717..eb024a5c 100644
--- a/1000-hours/sounds-of-american-english/1.2-alphabets.md
+++ b/1000-hours/sounds-of-american-english/1.2-alphabets.md
@@ -1,36 +1,40 @@
 # 1.2 英文字母
 
+英语总计使用 26 个**字母**（*letters*），各有大小写之分。在欧洲语言之中，英语是罕见的不使用**修饰符**（*diacritics*）的文字 —— 所谓修饰符，指的是字母上附加的标记，用以区分发音或者意义，比如，*â*、*é*、*ç*，等等。
 
-| Letter     | Pronunciation                                                                                                                                                          | NATO Phonetic Alphabet                                                                                                                                                                |
-|------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **A** *a*  | <span class="pho alt">eɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/a-us-male.mp3" data-audio-us-female="/audios/a-us-female.mp3"></span>          | *Alpha*    <span class="pho alt">ˈælfə</span><span class="speak-word-inline" data-audio-us-male="/audios/Alpha-us-male.mp3" data-audio-us-female="/audios/Alpha-us-female.mp3"></span>    |
-| **B** *b*  | <span class="pho alt">biː</span><span class="speak-word-inline" data-audio-us-male="/audios/b-us-male.mp3" data-audio-us-female="/audios/b-us-female.mp3"></span>         | *Bravo*    <span class="pho alt">ˈbrɑːvoʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Bravo-us-male.mp3" data-audio-us-female="/audios/Bravo-us-female.mp3"></span> |
-| **C** *c*  | <span class="pho alt">siː</span><span class="speak-word-inline" data-audio-us-male="/audios/c-us-male.mp3" data-audio-us-female="/audios/c-us-female.mp3"></span>         | *Charlie*  <span class="pho alt">ˈtʃɑːrli</span><span class="speak-word-inline" data-audio-us-male="/audios/Charlie-us-male.mp3" data-audio-us-female="/audios/Charlie-us-female.mp3"></span> |
-| **D** *d*  | <span class="pho alt">diː</span><span class="speak-word-inline" data-audio-us-male="/audios/d-us-male.mp3" data-audio-us-female="/audios/d-us-female.mp3"></span>         | *Delta*    <span class="pho alt">ˈdeltə</span><span class="speak-word-inline" data-audio-us-male="/audios/Delta-us-male.mp3" data-audio-us-female="/audios/Delta-us-female.mp3"></span>   |
-| **E** *e*  | <span class="pho alt">iː</span><span class="speak-word-inline" data-audio-us-male="/audios/e-us-male.mp3" data-audio-us-female="/audios/e-us-female.mp3"></span>          | *Echo*     <span class="pho alt">ˈekoʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Echo-us-male.mp3" data-audio-us-female="/audios/Echo-us-female.mp3"></span>      |
-| **F** *f*  | <span class="pho alt">ef</span><span class="speak-word-inline" data-audio-us-male="/audios/f-us-male.mp3" data-audio-us-female="/audios/f-us-female.mp3"></span>          | *Foxtrot*  <span class="pho alt">ˈfɔːkstrɒt</span><span class="speak-word-inline" data-audio-us-male="/audios/Foxtrot-us-male.mp3" data-audio-us-female="/audios/Foxtrot-us-female.mp3"></span> |
-| **G** *g*  | <span class="pho alt">dʒiː</span><span class="speak-word-inline" data-audio-us-male="/audios/g-us-male.mp3" data-audio-us-female="/audios/g-us-female.mp3"></span>        | *Golf*     <span class="pho alt">ɡɑːf</span><span class="speak-word-inline" data-audio-us-male="/audios/Golf-us-male.mp3" data-audio-us-female="/audios/Golf-us-female.mp3"></span>        |
-| **H** *h*  | <span class="pho alt">eɪtʃ</span><span class="speak-word-inline" data-audio-us-male="/audios/h-us-male.mp3" data-audio-us-female="/audios/h-us-female.mp3"></span>        | *Hotel*    <span class="pho alt">hoʊˈtel</span><span class="speak-word-inline" data-audio-us-male="/audios/Hotel-us-male.mp3" data-audio-us-female="/audios/Hotel-us-female.mp3"></span>   |
-| **I** *i*  | <span class="pho alt">aɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/i-us-male.mp3" data-audio-us-female="/audios/i-us-female.mp3"></span>          | *India*    <span class="pho alt">ˈɪndiə</span><span class="speak-word-inline" data-audio-us-male="/audios/India-us-male.mp3" data-audio-us-female="/audios/India-us-female.mp3"></span>    |
-| **J** *j*  | <span class="pho alt">dʒeɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/j-us-male.mp3" data-audio-us-female="/audios/j-us-female.mp3"></span>        | *Juliet*   <span class="pho alt">ˈdʒuːliət, ˈdʒuːliˌet</span><span class="speak-word-inline" data-audio-us-male="/audios/Juliet-us-male.mp3" data-audio-us-female="/audios/Juliet-us-female.mp3"></span> |
-| **K** *k*  | <span class="pho alt">keɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/k-us-male.mp3" data-audio-us-female="/audios/k-us-female.mp3"></span>         | *Kilo*     <span class="pho alt">ˈkiːloʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Kilo-us-male.mp3" data-audio-us-female="/audios/Kilo-us-female.mp3"></span>    |
-| **L** *l*  | <span class="pho alt">el</span><span class="speak-word-inline" data-audio-us-male="/audios/l-us-male.mp3" data-audio-us-female="/audios/l-us-female.mp3"></span>          | *Lima*     <span class="pho alt">ˈliːmə</span><span class="speak-word-inline" data-audio-us-male="/audios/Lima-us-male.mp3" data-audio-us-female="/audios/Lima-us-female.mp3"></span>     |
-| **M** *m*  | <span class="pho alt">em</span><span class="speak-word-inline" data-audio-us-male="/audios/m-us-male.mp3" data-audio-us-female="/audios/m-us-female.mp3"></span>          | *Mike*     <span class="pho alt">maɪk</span><span class="speak-word-inline" data-audio-us-male="/audios/Mike-us-male.mp3" data-audio-us-female="/audios/Mike-us-female.mp3"></span>        |
-| **N** *n*  | <span class="pho alt">en</span><span class="speak-word-inline" data-audio-us-male="/audios/n-us-male.mp3" data-audio-us-female="/audios/n-us-female.mp3"></span>          | *November* <span class="pho alt">noʊˈvembɚ</span><span class="speak-word-inline" data-audio-us-male="/audios/November-us-male.mp3" data-audio-us-female="/audios/November-us-female.mp3"></span> |
-| **O** *o*  | <span class="pho alt">oʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/o-us-male.mp3" data-audio-us-female="/audios/o-us-female.mp3"></span>          | *Oscar*    <span class="pho alt">ˈɑːskɑːr</span><span class="speak-word-inline" data-audio-us-male="/audios/Oscar-us-male.mp3" data-audio-us-female="/audios/Oscar-us-female.mp3"></span>  |
-| **P** *p*  | <span class="pho alt">piː</span><span class="speak-word-inline" data-audio-us-male="/audios/p-us-male.mp3" data-audio-us-female="/audios/p-us-female.mp3"></span>         | *Papa*     <span class="pho alt">ˈpɑːpɑ</span><span class="speak-word-inline" data-audio-us-male="/audios/Papa-us-male.mp3" data-audio-us-female="/audios/Papa-us-female.mp3"></span>      |
-| **Q** *q*  | <span class="pho alt">kjuː</span><span class="speak-word-inline" data-audio-us-male="/audios/q-us-male.mp3" data-audio-us-female="/audios/q-us-female.mp3"></span>        | *Quebec*   <span class="pho alt">kwəˈbek</span><span class="speak-word-inline" data-audio-us-male="/audios/Quebec-us-male.mp3" data-audio-us-female="/audios/Quebec-us-female.mp3"></span>  |
-| **R** *r*  | <span class="pho alt">ɑːr</span><span class="speak-word-inline" data-audio-us-male="/audios/r-us-male.mp3" data-audio-us-female="/audios/r-us-female.mp3"></span>         | *Romeo*    <span class="pho alt">ˈroʊmioʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Romeo-us-male.mp3" data-audio-us-female="/audios/Romeo-us-female.mp3"></span>  |
-| **S** *s*  | <span class="pho alt">es</span><span class="speak-word-inline" data-audio-us-male="/audios/s-us-male.mp3" data-audio-us-female="/audios/s-us-female.mp3"></span>          | *Sierra*   <span class="pho alt">siˈerə</span><span class="speak-word-inline" data-audio-us-male="/audios/Sierra-us-male.mp3" data-audio-us-female="/audios/Sierra-us-female.mp3"></span>  |
-| **T** *t*  | <span class="pho alt">tiː</span><span class="speak-word-inline" data-audio-us-male="/audios/t-us-male.mp3" data-audio-us-female="/audios/t-us-female.mp3"></span>         | *Tango*    <span class="pho alt">ˈtæŋɡoʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Tango-us-male.mp3" data-audio-us-female="/audios/Tango-us-female.mp3"></span>   |
-| **U** *u*  | <span class="pho alt">juː</span><span class="speak-word-inline" data-audio-us-male="/audios/u-us-male.mp3" data-audio-us-female="/audios/u-us-female.mp3"></span>         | *Uniform*  <span class="pho alt">ˈjuːnəfɔːrm</span><span class="speak-word-inline" data-audio-us-male="/audios/Uniform-us-male.mp3" data-audio-us-female="/audios/Uniform-us-female.mp3"></span> |
-| **V** *v*  | <span class="pho alt">viː</span><span class="speak-word-inline" data-audio-us-male="/audios/v-us-male.mp3" data-audio-us-female="/audios/v-us-female.mp3"></span>         | *Victor*   <span class="pho alt">ˈvɪktɚ</span><span class="speak-word-inline" data-audio-us-male="/audios/Victor-us-male.mp3" data-audio-us-female="/audios/Victor-us-female.mp3"></span>   |
-| **W** *w*  | <span class="pho alt">ˈdʌbᵊljuː</span><span class="speak-word-inline" data-audio-us-male="/audios/w-us-male.mp3" data-audio-us-female="/audios/w-us-female.mp3"></span>   | *Whiskey*  <span class="pho alt">ˈwɪskiː</span><span class="speak-word-inline" data-audio-us-male="/audios/Whiskey-us-male.mp3" data-audio-us-female="/audios/Whiskey-us-female.mp3"></span> |
-| **X** *x*  | <span class="pho alt">eks</span><span class="speak-word-inline" data-audio-us-male="/audios/x-us-male.mp3" data-audio-us-female="/audios/x-us-female.mp3"></span>         | *X-ray*    <span class="pho alt">ˈeks.reɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/X-ray-us-male.mp3" data-audio-us-female="/audios/X-ray-us-female.mp3"></span>   |
-| **Y** *y*  | <span class="pho alt">waɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/y-us-male.mp3" data-audio-us-female="/audios/y-us-female.mp3"></span>         | *Yankee*   <span class="pho alt">ˈjæŋkiː</span><span class="speak-word-inline" data-audio-us-male="/audios/Yankee-us-male.mp3" data-audio-us-female="/audios/Yankee-us-female.mp3"></span>  |
+北约（NATO）有一套指称英文字母的系统，用以在仅有语音交流的情况下避免歧义 —— 在军事、航空、紧急救助、无线电或者电话沟通等诸多场合中具备不可或缺的作用。
+
+| Letter    | Pronunciation                                                                                                                                      | NATO Phonetic Alphabet                                                                                                                                                      |
+| --------- | -------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| **A** *a* | <span class="pho alt">eɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/a-us-male.mp3" data-audio-us-female="/audios/a-us-female.mp3"></span>          | *Alpha*    <span class="pho alt">ˈælfə</span><span class="speak-word-inline" data-audio-us-male="/audios/Alpha-us-male.mp3" data-audio-us-female="/audios/Alpha-us-female.mp3"></span>            |
+| **B** *b* | <span class="pho alt">biː</span><span class="speak-word-inline" data-audio-us-male="/audios/b-us-male.mp3" data-audio-us-female="/audios/b-us-female.mp3"></span>         | *Bravo*    <span class="pho alt">ˈbrɑːvoʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Bravo-us-male.mp3" data-audio-us-female="/audios/Bravo-us-female.mp3"></span>         |
+| **C** *c* | <span class="pho alt">siː</span><span class="speak-word-inline" data-audio-us-male="/audios/c-us-male.mp3" data-audio-us-female="/audios/c-us-female.mp3"></span>         | *Charlie*  <span class="pho alt">ˈtʃɑːrli</span><span class="speak-word-inline" data-audio-us-male="/audios/Charlie-us-male.mp3" data-audio-us-female="/audios/Charlie-us-female.mp3"></span>    |
+| **D** *d* | <span class="pho alt">diː</span><span class="speak-word-inline" data-audio-us-male="/audios/d-us-male.mp3" data-audio-us-female="/audios/d-us-female.mp3"></span>         | *Delta*    <span class="pho alt">ˈdeltə</span><span class="speak-word-inline" data-audio-us-male="/audios/Delta-us-male.mp3" data-audio-us-female="/audios/Delta-us-female.mp3"></span>           |
+| **E** *e* | <span class="pho alt">iː</span><span class="speak-word-inline" data-audio-us-male="/audios/e-us-male.mp3" data-audio-us-female="/audios/e-us-female.mp3"></span>          | *Echo*     <span class="pho alt">ˈekoʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Echo-us-male.mp3" data-audio-us-female="/audios/Echo-us-female.mp3"></span>              |
+| **F** *f* | <span class="pho alt">ef</span><span class="speak-word-inline" data-audio-us-male="/audios/f-us-male.mp3" data-audio-us-female="/audios/f-us-female.mp3"></span>          | *Foxtrot*  <span class="pho alt">ˈfɔːkstrɒt</span><span class="speak-word-inline" data-audio-us-male="/audios/Foxtrot-us-male.mp3" data-audio-us-female="/audios/Foxtrot-us-female.mp3"></span>   |
+| **G** *g* | <span class="pho alt">dʒiː</span><span class="speak-word-inline" data-audio-us-male="/audios/g-us-male.mp3" data-audio-us-female="/audios/g-us-female.mp3"></span>        | *Golf*     <span class="pho alt">ɡɑːf</span><span class="speak-word-inline" data-audio-us-male="/audios/Golf-us-male.mp3" data-audio-us-female="/audios/Golf-us-female.mp3"></span>                |
+| **H** *h* | <span class="pho alt">eɪtʃ</span><span class="speak-word-inline" data-audio-us-male="/audios/h-us-male.mp3" data-audio-us-female="/audios/h-us-female.mp3"></span>        | *Hotel*    <span class="pho alt">hoʊˈtel</span><span class="speak-word-inline" data-audio-us-male="/audios/Hotel-us-male.mp3" data-audio-us-female="/audios/Hotel-us-female.mp3"></span>           |
+| **I** *i* | <span class="pho alt">aɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/i-us-male.mp3" data-audio-us-female="/audios/i-us-female.mp3"></span>          | *India*    <span class="pho alt">ˈɪndiə</span><span class="speak-word-inline" data-audio-us-male="/audios/India-us-male.mp3" data-audio-us-female="/audios/India-us-female.mp3"></span>          |
+| **J** *j* | <span class="pho alt">dʒeɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/j-us-male.mp3" data-audio-us-female="/audios/j-us-female.mp3"></span>        | *Juliet*   <span class="pho alt">ˈdʒuːliət, ˈdʒuːliˌet</span><span class="speak-word-inline" data-audio-us-male="/audios/Juliet-us-male.mp3" data-audio-us-female="/audios/Juliet-us-female.mp3"></span>     |
+| **K** *k* | <span class="pho alt">keɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/k-us-male.mp3" data-audio-us-female="/audios/k-us-female.mp3"></span>         | *Kilo*     <span class="pho alt">ˈkiːloʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Kilo-us-male.mp3" data-audio-us-female="/audios/Kilo-us-female.mp3"></span>            |
+| **L** *l* | <span class="pho alt">el</span><span class="speak-word-inline" data-audio-us-male="/audios/l-us-male.mp3" data-audio-us-female="/audios/l-us-female.mp3"></span>          | *Lima*     <span class="pho alt">ˈliːmə</span><span class="speak-word-inline" data-audio-us-male="/audios/Lima-us-male.mp3" data-audio-us-female="/audios/Lima-us-female.mp3"></span>             |
+| **M** *m* | <span class="pho alt">em</span><span class="speak-word-inline" data-audio-us-male="/audios/m-us-male.mp3" data-audio-us-female="/audios/m-us-female.mp3"></span>          | *Mike*     <span class="pho alt">maɪk</span><span class="speak-word-inline" data-audio-us-male="/audios/Mike-us-male.mp3" data-audio-us-female="/audios/Mike-us-female.mp3"></span>                |
+| **N** *n* | <span class="pho alt">en</span><span class="speak-word-inline" data-audio-us-male="/audios/n-us-male.mp3" data-audio-us-female="/audios/n-us-female.mp3"></span>          | *November* <span class="pho alt">noʊˈvembɚ</span><span class="speak-word-inline" data-audio-us-male="/audios/November-us-male.mp3" data-audio-us-female="/audios/November-us-female.mp3"></span> |
+| **O** *o* | <span class="pho alt">oʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/o-us-male.mp3" data-audio-us-female="/audios/o-us-female.mp3"></span>          | *Oscar*    <span class="pho alt">ˈɑːskɑːr</span><span class="speak-word-inline" data-audio-us-male="/audios/Oscar-us-male.mp3" data-audio-us-female="/audios/Oscar-us-female.mp3"></span>         |
+| **P** *p* | <span class="pho alt">piː</span><span class="speak-word-inline" data-audio-us-male="/audios/p-us-male.mp3" data-audio-us-female="/audios/p-us-female.mp3"></span>         | *Papa*     <span class="pho alt">ˈpɑːpɑ</span><span class="speak-word-inline" data-audio-us-male="/audios/Papa-us-male.mp3" data-audio-us-female="/audios/Papa-us-female.mp3"></span>              |
+| **Q** *q* | <span class="pho alt">kjuː</span><span class="speak-word-inline" data-audio-us-male="/audios/q-us-male.mp3" data-audio-us-female="/audios/q-us-female.mp3"></span>        | *Quebec*   <span class="pho alt">kwəˈbek</span><span class="speak-word-inline" data-audio-us-male="/audios/Quebec-us-male.mp3" data-audio-us-female="/audios/Quebec-us-female.mp3"></span>          |
+| **R** *r* | <span class="pho alt">ɑːr</span><span class="speak-word-inline" data-audio-us-male="/audios/r-us-male.mp3" data-audio-us-female="/audios/r-us-female.mp3"></span>         | *Romeo*    <span class="pho alt">ˈroʊmioʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Romeo-us-male.mp3" data-audio-us-female="/audios/Romeo-us-female.mp3"></span>       |
+| **S** *s* | <span class="pho alt">es</span><span class="speak-word-inline" data-audio-us-male="/audios/s-us-male.mp3" data-audio-us-female="/audios/s-us-female.mp3"></span>          | *Sierra*   <span class="pho alt">siˈerə</span><span class="speak-word-inline" data-audio-us-male="/audios/Sierra-us-male.mp3" data-audio-us-female="/audios/Sierra-us-female.mp3"></span>         |
+| **T** *t* | <span class="pho alt">tiː</span><span class="speak-word-inline" data-audio-us-male="/audios/t-us-male.mp3" data-audio-us-female="/audios/t-us-female.mp3"></span>         | *Tango*    <span class="pho alt">ˈtæŋɡoʊ</span><span class="speak-word-inline" data-audio-us-male="/audios/Tango-us-male.mp3" data-audio-us-female="/audios/Tango-us-female.mp3"></span>          |
+| **U** *u* | <span class="pho alt">juː</span><span class="speak-word-inline" data-audio-us-male="/audios/u-us-male.mp3" data-audio-us-female="/audios/u-us-female.mp3"></span>         | *Uniform*  <span class="pho alt">ˈjuːnəfɔːrm</span><span class="speak-word-inline" data-audio-us-male="/audios/Uniform-us-male.mp3" data-audio-us-female="/audios/Uniform-us-female.mp3"></span> |
+| **V** *v* | <span class="pho alt">viː</span><span class="speak-word-inline" data-audio-us-male="/audios/v-us-male.mp3" data-audio-us-female="/audios/v-us-female.mp3"></span>         | *Victor*   <span class="pho alt">ˈvɪktɚ</span><span class="speak-word-inline" data-audio-us-male="/audios/Victor-us-male.mp3" data-audio-us-female="/audios/Victor-us-female.mp3"></span>        |
+| **W** *w* | <span class="pho alt">ˈdʌbᵊljuː</span><span class="speak-word-inline" data-audio-us-male="/audios/w-us-male.mp3" data-audio-us-female="/audios/w-us-female.mp3"></span> | *Whiskey*  <span class="pho alt">ˈwɪskiː</span><span class="speak-word-inline" data-audio-us-male="/audios/Whiskey-us-male.mp3" data-audio-us-female="/audios/Whiskey-us-female.mp3"></span>      |
+| **X** *x* | <span class="pho alt">eks</span><span class="speak-word-inline" data-audio-us-male="/audios/x-us-male.mp3" data-audio-us-female="/audios/x-us-female.mp3"></span>         | *X-ray*    <span class="pho alt">ˈeks.reɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/X-ray-us-male.mp3" data-audio-us-female="/audios/X-ray-us-female.mp3"></span>          |
+| **Y** *y* | <span class="pho alt">waɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/y-us-male.mp3" data-audio-us-female="/audios/y-us-female.mp3"></span>         | *Yankee*   <span class="pho alt">ˈjæŋkiː</span><span class="speak-word-inline" data-audio-us-male="/audios/Yankee-us-male.mp3" data-audio-us-female="/audios/Yankee-us-female.mp3"></span>        |
 | **Z** *z* | <span class="pho alt">ziː</span><span class="speak-word-inline" data-audio-us-male="/audios/z-us-male.mp3" data-audio-us-female="/audios/z-us-female.mp3"></span>         | *Zulu*     <span class="pho alt">ˈzuːluː</span><span class="speak-word-inline" data-audio-us-male="/audios/Zulu-us-male.mp3" data-audio-us-female="/audios/Zulu-us-female.mp3"></span>            |
 
+在英式英语中，*z* 被读作 <span class="pho alt">zed</span><span class="speak-word-inline" data-audio-uk-female="/audios/zed-uk-female.mp3"></span>。
 
-在英式英语中，*z* 被读作 <span class="pho alt">zed</span><span class="speak-word-inline" data-audio-uk-female="/audios/zed-uk.mp3"></span>。
-
-In British, letter *z* is pronounced as <span class="pho alt">zed</span><span class="speak-word-inline" data-audio-uk-female="/audios/zed-uk.mp3"></span>.
\ No newline at end of file
+> [!Note]
+>
+> * 合成语音文件使用的是 OpenAI 的 TTS (Text-to-Speech) 和微软的 Edge's TTS。蓝色喇叭图标<span class="speak-word-inline" data-audio-us-male="/audios/Alpha-us-male.mp3"></span>是男性语音，红色喇叭图标<span class="speak-word-inline" data-audio-us-female="/audios/Alpha-us-female.mp3"></span>是女性语音。