Subgingival
[医] 龈下的
🗣️ 情景例句
Sure, I'll let you take my daughter you, but make sure she is back by 10.
可以，你可以带我女儿出去，但你要保证十点前把她带回来。
I will have done it by the time you come back.
在你回来之前，我会做完它。[将来完成时，表示将完成…，会做完…]
The only thing to do was ask them to come half an hour later than the other guests.
唯一的办法就是请他们比别的客人晚来半小时。