1.political transition 政治转型

例句:And like many countries, we support a period of political transition in Syria.
我们和许多国家都支持在叙利亚出现一个政治过渡的时期A2PT(;.pCoohk*dI5u。

2.main challenge 主要的挑战

例句:Achieving economic, social and political equality had become the main challengefacing humanity.
实现经济、社会和政治上的平等，已成为人类面临的重大挑战sLZrYB+[TsF0N(AJD3J。

3.between and 之间

例句:The film explores the relationship between artist and instrument.
这部电影探究了艺术家和乐器之间的关系w.K%C2mZchD3L8D。

4.swear in 发誓

例句:Soon after the New Year, the new Congress will come to Washington to be sworn in.
新年后不久，新一届国会议员就将前往华盛顿宣誓就职bzEA|J42sDR23.Q&ahQ0。