BBC在线收听下载:美国宇航局称有证据显示火星表面有液态水

短语讲解：

1. At thissummit, more than 50 countries, from Bangladesh to Colombia, from Finland to China, are making commitments total in more than 30, 000 new troops and police.

more than 多于
例句：Rob likes apples more than bananas.
罗勃对苹果比对香蕉还喜欢。

2. And they’re serving up with critical contributions like medical units,helicopters and capabilities to counter IEDs( Improvised Explosive Devices ) whichwill help peacekeepers be able to stay safe and succeed in their missions.

be able to 能够
例句：He will be able to take up his normal routine shortly.
他不久就能处理日常事务。

3. Reports from the Central African Republic say several hundredinmates have escaped from the main prison in the capital Bangui.

escape from 逃避; 逃出; 从…漏出; 发出
例句：The jailer connived at the escape from prison.
狱吏纵容犯人的逃狱。

4. Earlier, United Nationspeacekeepers fired shots in the air to disperse thousands of protesters callingfor the rearming of the military and resignation of President Catherine Samba-Panza.

thousands of 数千的
例句：The game drew thousands of spectators.
这场比赛吸引了数千名观众。