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

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+# 3.2.6. `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。
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+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.
+
+==此处需要图片==
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+需要注意的是，`s` 之后的 `p`、`t`、`tr`、`k` 会被浊化，相应读成 `b`、`d`、`dr`、`g`（但是，音标标注却保持原样）：
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+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.
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+> * *speak* `/spiːk/` → `/sbiːk/`
+> * *student* `/ˈstudənt/` → `/ˈsdudənt/`
+> * *school* `/skuːl/` → `/sguːl/`
+> * *frustrate* `/ˈfrʌˌstreɪt/` → `/ˈfrʌˌsdreɪt/`