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1000-hours/sounds-of-american-english/2.2.6-sz.md

@@ -1,8 +1,8 @@
 # 2.2.6. `s/z`
 
-`s/z` 对所有人来说都没有什么具体的难度。`s/z` 发声时起始的舌尖位置贴近但没有接触到牙齿和牙龈的接缝处。
+`s/z` 对所有人来说都没有什么具体的难度。`s/z` 发声时起始的舌尖位置贴近但没有接触到牙齿和牙龈的接缝处 —— 即，位置 ②（参见 [1.4](1.4-articulators)）。
 
-The `s/z` sounds don't really pose a challenge for most people. When producing these sounds, the tip of the tongue is close to, but not touching, the *seam* between teeth and gums.
+The `s/z` sounds don't really pose a challenge for most people. When producing these sounds, the tip of the tongue is close to, but not touching, the *seam* between teeth and gums, i.e. position ② (as described in [1.4](1.4-articulators)).
 
 ![articulator-tongue-tip-sz](/images/articulator-tongue-tip-sz.svg)
 
@@ -10,10 +10,10 @@ The `s/z` sounds don't really pose a challenge for most people. When producing t
 
 It's important to note that following an `s`, `p/t/tr/k` are voiced, meaning they are pronounced like `b/d/dr/g` respectively, while the phonetic annotations remain unchanged.
 
-> * *speak* `/spiːk/` → `/sbiːk/`
-> * *student* `/ˈstudənt/` → `/ˈsdudənt/`
-> * *school* `/skuːl/` → `/sguːl/`
-> * *frustrate* `/ˈfrʌˌstreɪt/` → `/ˈfrʌˌsdreɪt/`
+> * *speak* `/spiːk/` → `/sbiːk/`<span class="speak-word-inline" data-audio-us-male="/audios/us/speak-us-male.mp3" data-audio-us-female="/audios/us/speak-us-female.mp3"></span>
+> * *student* `/ˈstudənt/` → `/ˈsdudənt/`<span class="speak-word-inline" data-audio-us-male="/audios/us/student-us-male.mp3" data-audio-us-female="/audios/us/student-us-female.mp3"></span>
+> * *school* `/skuːl/` → `/sguːl/`<span class="speak-word-inline" data-audio-us-male="/audios/us/school-us-male.mp3" data-audio-us-female="/audios/us/school-us-female.mp3"></span>
+> * *frustrate* `/ˈfrʌˌstreɪt/` → `/ˈfrʌˌsdreɪt/`<span class="speak-word-inline" data-audio-us-male="/audios/us/frustrate-us-male.mp3" data-audio-us-female="/audios/us/frustrate-us-female.mp3"></span>
 
 另外，英文的辅音并没有长短区分 —— 有些语言的辅音是有长短区分的，虽然亚洲语言基本都没有这种差别。然而，英文的 `f/v`、`s/z`、`ʃ` 是可以拉长的，尤其是 `s/z`。