在英语中,通常字母 t 做音节头时发音时 [th],注意,这里[t]右上角的 h 表示这是个送气音; 但是如果 st 一起出现在音节头,也就是说 t 跟在 s 后面,那么 t 的发音变成 [t], 也就是不送气了。此时在听觉上近似于 /d/,但是声带不振动,所以也可以标记为 [do].
下面列出一些 [th] 和 [t] ([do]) 对比的词供大家练习:
| [th] | [do] | 
| top | stop | 
| till | still | 
| team | steam | 
| tray | stray | 
| treat | street | 
| truck | structure | 
下列列出一些含有 st 做音节头的单词和 含有 t 做音节头的单词的句子供大家练习:
1. The airplane stopped at the top of the hill.
2. We will still be here until we finish this project.
3. The structure of this truck is like a ship.
4. The rescue team treated the homeless on the street nicely.
5. The team are steaming those wooden crates.