1、depress
使抑郁;使沮丧;使消沉
I must admit the state of the country depresses me.
我必须承认国家的现状让我倍感沮丧。
I know he is too optimistic but I don't want to depress him.
我知道他太过乐观了，但我不想令他灰心丧气。
降低;减少
The stronger U.S. dollar depressed sales.
美元走强导致销售额下降。
2、go back
追溯到；回溯到
The feud with the Catholics goes back to the 11th century.
与天主教的夙怨可以追溯到11世纪。
Our association with him goes back four years.
我们同他的合作是从4年前开始的。
回到（过去）；回顾
If you go back to 1960, you'll find that very few jobs were being created.
如果回到1960年，你会发现工作机会寥寥无几。
3、entertain
使快乐；给…以娱乐；使有兴趣
games and ideas to entertain children.
带给孩子们快乐的游戏和想法
They were entertained by top singers, dancers and celebrities.
顶级歌手、舞蹈演员和名人们给他们带来娱乐。
招待;款待
I don't like to entertain guests anymore.
我再也不想招待客人了。
You weren't allowed to entertain men in your rooms even with a chaperone.
即使你有监护人陪同，也不允许在房间里招待男性。
考虑，心存，怀有（主意、建议等）
I feel how foolish I am to entertain doubts.
我竟然心存怀疑，真是太愚蠢了。
I wouldn't entertain the idea of such an unsociable job.
我不会考虑从事这种不跟人打交道的工作。