BBC在线收听下载:伦敦街头发生疑似恐怖袭击 一士兵被砍死

短语讲解：

1. So I went back and immediately got school to lock down to make sure the children were safe, to get them all inside if they were doing outside activities.

make sure 确定
例句：Make sure you fully get it.
确定你能完全得到这些信息。

2. An emergency meeting of senior government ministers and security officials has taken place, and the Prime Minister David Cameron is returning early from a visit to France.

take place 发生，举行；来
例句：Where were you? Where did it take place?
你当时在哪儿?在哪儿发生的?

3. In other news, the FBI says one of its agents has shot dead a man who was being questioned in connection with the Boston bombings in the United States last month.

in connection with 与…有关，连同
例句：Police are holding two men in connection with last Thursday's bank robbery. 
警方拘留了两名与上星期四的银行劫案有关的人. 

4. so far, and one officer has been injured.

so far 到目前为止
例句：Can you repeat the affected cities so far?
能重复一下到目前为止受到感染的城市吗？