例句：
It will take a while for the drug to work out of your system.
这药得需要一段时间才能排出你的体外。
I'll be back in a little while.
我一会儿就回来。
You'll water the plants while I'm away, won't you?
我外出的`时候请你给花草浇浇水，行不行？
Her parents died while she was still at school.
她还在读书时父母就去世了。
He'll do the job if you make it worth his while.
你要是给他的报酬丰厚，他会做这份工作的。