例句：The reforms had unexpected repercussions.
      改革带来了意想不到的后果。

2.solution n.溶液

例句：A gas in solution diffuses from region of greater to one of less concentration.
      溶液中的气体由浓度较高的区域向浓度较低的区域扩散。

3.certification n.证明;鉴定;证书

例句：He received his certification as a high school English teacher.
      他取得了中学英语教师证书。

4.advocate n.提倡者, 拥护者

例句：He is an advocate of more airplanes and fewer warships.
      他是一个提倡多造飞机、少造军舰的人。

5.involuntary adj.无意识做出的;非故意的

例句：He gave an involuntary smile.
       他不由自主地笑了一下。
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