I'm sure she's keeping something back from us.
我肯定她有什么事瞒着我们。
Some teachers find it difficult to keep their classes in order.
有些教师觉得难以维持课堂秩序。
Keep down! You mustn't let anyone see you.
蹲下！一定不要让人看见你。
I keep thinking back to the day I arrived here.
我不断回想起刚到这儿那一天的情景。
Keep that dog out of my study!
别让那狗进我的书房！
