keep例句：
1、I go swimming every day in order to keep fit.
我每天游泳以保持健康。
2、You'll need to keep a clear head for your interview.
你面試時需要保持清醒的'頭腦。
3、I said I'd go just to keep him happy.
我說過我要去只是為了讓他高興。
4、I can't keep up with all the changes.
我并非所有的變化都能跟得上。
5、It is important to keep in touch with the latest research.
及時掌握最新研究情況很重要。