It will take a while for the drug to work out of your system.

　　這藥得需要一段時間才能排出你的體外。

　　I'll be back in a little while.

　　我一會兒就回來。

　　You'll water the plants while I'm away, won't you?

　　我外出的時候請你給花草澆澆水，行不行？

　　Her parents died while she was still at school.

　　她還在讀書時父母就去世了。

　　He'll do the job if you make it worth his while.

　　你要是給他的報(bào)酬豐厚，他會做這份工作的。