S.t.u.
[医] 皮肤试验单位
🗣️ 情景例句
Why don't you go to your room, Mom, and get some sleep.
为什么不到你的房间去？妈妈， 去睡一会儿。
Excuse me to have troubled you.
对不起麻烦你。
What time will the next train leave?
下一班火车什么时候开？