【句子】Why would you cover your tracks? 【The Vampire Diaries-S1E4】
【发音】[waɪ] [wʊd] [ju:] ['kʌvə(r)] [jɔ:(r)] [træks]
【发音技巧】would you音的同化；
【翻译】你为什么要掩盖行踪？
【适用场合】
cover one’s tracks 隐藏行踪；掩盖行踪
to hide any evidence that you were somewhere or did something
eg: The killer may have returned to the scene of the crime to cover his tracks.
凶手有可能返回了犯罪现场，掩盖行踪。

keep track of sb./sth. 实时追踪；随时知道情况
If you keep track of a situation or a person, you make sure that you have the newest and most accurate information about them all the time.
eg: We need a system to keep track of all our expenses.
我们需要一个系统，能够实时记录我们的花销。

eg: With eleven thousand employees, it's very difficult to keep track of them all.
这个公司有1万1千名员工，很难掌握每个人的情况。

lose track of sb./sth. 不记得；失去……的线索；
to forget something or not have all the information you need:

【尝试翻译以下句子，并留言在文章留言区】
我不记得上周他打了几次电话了。