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重点讲解：
1. sign up for (和…)签约；雇用；报名(参加课程)；
例句：If anger management is difficult for you, sign up for a course to help you deal with it.
如果对你来说管理愤怒很困难，那么报名参加一个帮助你解决的课程。
2. a series of 一连串；一系列；连续；接连；
例句：The council has organised a series of events and competitions for school children in the area.
委员会为本地区的中小学生组织了一系列的活动和比赛。
3. think of 想到；想起；想出；
例句：We maligned him dreadfully when you come to think of it.
回头想想，我们狠狠地中伤了他。
vt. 理解，懂，听说，获悉，将 ... 理解为，认为<
