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上星期我朋友的公司出了一起风波。一名会计被发现挪用公款。他连续几个月没被发现，因为他做得很隐蔽。我们可以用一个习惯用语来形容他的这种做法，那就是cover one's tracks. To cover one's tracks意思就是掩盖行踪/计划。上面的例子中，The accountant was able to cover his tracks for a long time before his scheme was finally discovered.(这位会计长期隐瞒证据，直到他的阴谋被发现。)下面我们再来看一个例子，看看一名罪犯越狱之后是如何掩饰自己行踪的： 例句1：The prisoner escaped weeks ago. The police had a hard time finding her because she covered her tracks. She was careful not to use her real name and she kept traveling from one state to another. When her photo appeared on TV, a viewer reported seeing her. And she was finally captured. 这名犯人几星期前越狱，警方费了好大力气搜捕她，但是她很好地掩盖了自己的行踪。她不使用真名，而且不停在州与州之间转移。直到她的照片被公布在电视上，有人举报说曾经见过她，才终于把她抓了回来。 Cover one's tracks也不一定都是干坏事，这个短语也可以用来表示“掩盖计划、隐藏证据等。 下面的这个例子里，兄妹俩人为了给他们的妈妈制造一个惊喜派对，一直试图掩饰他们的计划。让我们来看看他们都做了些什么: | 
