BBC在线收听下载:美国进行中期选举 华盛顿权利平衡生变

短语讲解：

1. The announcement came after the rebels held elections on Sunday in the self-proclaimed Donetsk and Luhansk Republics.

come after 跟着…来，跟在…后面
例句：Men's best successes come after their disappointments.
人们往往在失意之后获取大的成功。

2. Mr. Poroshenko said he'd also mobilized a number of army units to prevent any possible attack by Russian-backed rebels.

a number of 许多的; 一些
例句：A number of drawbacks come to mind.
下面就是一些不好的方面。

3. The Mexican authorities have captured the fugitive mayor and his wife who were suspected of involvement in the disappearance of 43 students in the southwestern city of Iguala in late September.

be suspected of 被怀疑患有…，被怀疑（做）…
例句：He is suspected of employing trickery. 
他有弄虚作假的嫌疑。 

4. The Afghan government is taking steps to pursue a gang of alleged rapists after the victim's husband made an emotional appearance on the television to beg for justice.

take steps 采取措施
例句：The government may take steps to compel compliance with the law. 
政府可能采取步骤强制遵守法律。