everyone-can-use-english/1000-hours/sounds-of-american-english/3.2.6-sz.md

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。

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.

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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：

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.

• speak /spiːk/ → /sbiːk/
• student /ˈstudənt/ → /ˈsdudənt/
• school /skuːl/ → /sguːl/
• frustrate /ˈfrʌˌstreɪt/ → /ˈfrʌˌsdreɪt/