hide
藏；隐蔽
同义词：conceal
He hid the letter in a drawer.
他把信藏在抽屉里。
I keep my private papers hidden.
我藏起了我的私人文件。

mistake
(言语或行为上的)错误,失误
It's easy to make a mistake.
犯错误很容易。
This letter is addressed to someone else—there must be some mistake.
这封信是给别人的——一定是搞错了。
It would be a mistake to ignore his opinion.
忽略他的意见是不对的。

ambush
伏击；埋伏
Two soldiers were killed in a terrorist ambush.
两名士兵遭到恐怖分子伏击而死亡。
They were lying in ambush, waiting for the aid convoy.
他们埋伏起来,等着袭击援助车队。

fair
fair to sb
fair on sb
合理的；恰当的；适当的
a fair deal / wage / price / question
公平交易；合理的工资；公道的价格；恰当的问题
The punishment was very fair.
这个处罚很公正。

来源:可可英语 //m.moreplr.com/video/201710/526032.shtml