BBC在线收听下载:特朗普团队公开普京的信件

短语讲解：

1. The German Chancellor Angela Merkel says her government is doing everything humanly possible to step up security in the wake of the Berlin Christmas market attack.
 
step up 走上; （使） 增加
例句：We must step up our vigilance.
我们一定要提高警惕。

2. Mrs. Merkel spoke of her relief that the danger posed by the Tunisian who carried out the attack was over.

carry out 进行; 执行; 完成; 抬出去
例句：No matter what we do, we must carry out our duties.
无论干什么工作,我们都应履行自己的职责。