重点讲解：
1. take off (产品、活动、事业等)腾飞，突然成功；
例句：I think boxing will take off in a big way here.
我想拳击运动在这儿会有很大的发展tW8|PMa(b!ias。
2. show up 出现；
例句：When he eventually did show up, it was obvious to all that he had changed his original idea.
当他最终出现时，所有人都清楚他已经改变了他最初的想法D|ATjx+47fLMl。
3. at the expense of 以牺牲…的利益为代价；
例句：The dealers profited shamefully at the expense of my family.
这些经销商通过损害我家人的利益不光彩地赚钱pj;mxZuuTHc*kCyzb。
4. add up 加；增加；
例句：Add up all the income you've received over the period in question.
把那个时期里你拿到的所有收入加在一起OgKAv,hb1ja.。