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index 00000000..5e0e79d5
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diff --git a/1000-hours/public/audios/young-en-us-jenny-female.mp3 b/1000-hours/public/audios/young-en-us-jenny-female.mp3
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index 00000000..9528ac6d
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diff --git a/1000-hours/public/jupyter-notebooks/edge-tts-valcab-pronounciation.ipynb b/1000-hours/public/jupyter-notebooks/edge-tts-valcab-pronounciation.ipynb
index e53d4b2e..b7fd1006 100644
--- a/1000-hours/public/jupyter-notebooks/edge-tts-valcab-pronounciation.ipynb
+++ b/1000-hours/public/jupyter-notebooks/edge-tts-valcab-pronounciation.ipynb
@@ -76,7 +76,7 @@
     "import edge_tts\n",
     "import pygame\n",
     "\n",
-    "TEXT = \"happi\"\n",
+    "TEXT = \"Jane,dramatic,young,girl,loves,to,read,books,at,leisure,in,rooms,or,play,on,a,sunny,day,outdoor,here,and,there,under,the,trees,with,boys,She,vowed,to,buy,a,red,ear,dog,She,thought,it,was,unique,for,sure,Now,she,feeds,it,dough,nuts,and,cheese,bar\"\n",
     "Wordlist = TEXT.split(\",\")\n",
     "\n",
     "for w in Wordlist:\n",
@@ -135,22 +135,32 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "id": "00939422-fbf9-4842-b82a-b6106624c075",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "pygame 2.5.2 (SDL 2.28.3, Python 3.11.5)\n",
+      "Hello from the pygame community. https://www.pygame.org/contribute.html\n",
+      "Files created!\n"
+     ]
+    }
+   ],
    "source": [
     "import asyncio\n",
     "import edge_tts\n",
     "import pygame\n",
     "\n",
-    "TEXT = \"goal\"\n",
+    "TEXT = \"a,and,at,bar,books,boys,buy,cheese,day,dog,dough,dramatic,ear,feeds,for,girl,here,in,it,Jane,leisure,loves,Now,nuts,on,or,outdoor,play,read,red,rooms,She,sunny,sure,the,there,thought,to,trees,under,unique,vowed,was,with,young\"\n",
     "Wordlist = TEXT.split(\",\")\n",
     "\n",
     "for w in Wordlist:\n",
-    "  for VOICE in ['ko-KR-InJoonNeural']:\n",
+    "  for VOICE in ['en-US-GuyNeural', 'en-US-JennyNeural', 'en-GB-RyanNeural', 'en-GB-SoniaNeural']:\n",
     "    w = w.strip()\n",
-    "    OUTPUT_FILE = f\"{w}-{VOICE.replace('YunxiNeural', 'male').replace('XiaoxiaoNeural', 'female').lower()}.mp3\"\n",
+    "    OUTPUT_FILE = f\"{w}-{VOICE.replace('GuyNeural', 'Guy-Male').replace('JennyNeural', 'Jenny-Female').replace('RyanNeural', 'Ryan-Male').replace('SoniaNeural', 'Sonia-Female').lower()}.mp3\"\n",
     "    communicate = edge_tts.Communicate(w, VOICE)\n",
     "    await communicate.save(OUTPUT_FILE) \n",
     "\n",
diff --git a/1000-hours/sounds-of-english/01-4-pangram.md b/1000-hours/sounds-of-english/01-4-pangram.md
index 21366330..e955108b 100644
--- a/1000-hours/sounds-of-english/01-4-pangram.md
+++ b/1000-hours/sounds-of-english/01-4-pangram.md
@@ -4,7 +4,7 @@
 
 > Jane, a dramatic young girl, loves to read  books at leisure in rooms or play on a sunny day outdoor here and there under the trees with boys. She vowed to buy a red ear dog. She thought it was unique, for sure. Now she feeds it dough, nuts, and cheese bar.
 >
-> `/dʒeɪn, ə drəˈmætɪk jʌŋ gəː(r)l, lʌvz tuː riːd bʊks æt ˈliːʒə(r) ɪn rumz ɔː(r) pleɪ ɒn ə ˈsʌni deɪ ˈaʊtˌdɔr hiə(r) ənd ðeə ˈʌndə(r) ðə triz wɪθ bɔɪz. ʃiː vaʊd tʊ baɪ ə red ɪə(r) dɒg. ʃiː θɒt ɪt wɒz juˈniːk, fə(r) ʃʊə(r). naʊ ʃiː fiːdz ɪt dəʊ, nʌts, ənd tʃiːz bɑː(r)./`
+> `/dʒeɪn, ə drəˈmætɪk jʌŋ gəː(r)l, lʌvz tuː riːd bʊks æt ˈliːʒə(r) ɪn rumz ɔː(r) pleɪ ɒŋ ə ˈsʌni deɪ ˈaʊtˌdɔr hiə(r) ənd ðeə ˈʌndə(r) ðə triz wɪθ bɔɪz. ʃiː vaʊd tʊ baɪ ə red ɪə(r) dɒg. ʃiː θɒt ɪt wɒz juˈniːk, fə(r) ʃʊə(r). naʊ ʃiː fiːdz ɪt dəʊ, nʌts, ənd tʃiːz bɑː(r)./`
 
 Voice: Alloy (US Male)
 
@@ -20,8 +20,11 @@ Voice: Nova (US Female)
 ::: info
 以上两条语音，Alloy 和 Nova，使用 OpenAI 的 TTS 引擎生成。而教程中其它的词汇音频，大多数使用 Microsoft 的 [EdgeTTS](https://github.com/rany2/edge-tts) 生成。
 :::
-
 -----
 
+::: tip
+音素在自然语流中经常会有变化，比如，*on a sunny day* 中的 *on* `/ɒŋ/`，由于后面紧跟着一个元音，所以，会被读成 `/ɒn/` —— 也就是说，`ŋ` 变成了 `n`（[2.2.3](15-mn)）……
+:::
+
 [^1]: 所谓 *pangram*，指的是一个尽可能短的包含所有字母的句子。*The quick brown fox jumps over the lazy dog.* 就是大家练打字的时候都用过的经典 *pangram*。