BBC在线收听下载:美国承诺将对俄罗斯实施进一步制裁

短语讲解：

1. President Obama's decision to impose asset freezes and travel bans on nearly a dozen Russian and Ukrainian officials led to a mockery from some of those involved including Russia's deputy Prime Minister Dmitry Rogozin who took to Twitter to point out that he didn't have property or a bank account overseas.

lead to 把…带到; 领到; （道路）通向; 导致
例句：That can lead to serious consequences.
这会导致严重的后果。
point out 点明; 指明
例句：Nobody seems minded to point out an obvious fact.
似乎没人愿意指出一个显而易见的事实。

2. In Malaysia investigators are now unsure that it was someone on board who turned off the communication systems and turned the plane westwards.

turn off （把…）关掉; 完成; 解雇; 转向
例句：Could you please turn off the car radio?
请你把车上的收音机关掉行么？

3. The medical charity MSF has issued dire warnings about the plight of refugees fleeing the Central African Republic.

warn about 就…提出警告
例句：Environmental and industry groups warn about ethanol
环保团体和工业团体警示乙醇汽油的使用

4. United States has broken up a large online child pornography ring and arrested 14 people.

break up 结束; （使）破碎
例句：Her coalition would probably break up.
她的联盟很可能会分裂。

5. The Rolling Stones have called off their tour of Australia and New Zealand following the death on Monday of lead singer Mick Jagger's long-time girlfriend L'Wren Scott.

call off 转移（某人的注意力等）; 取消
例句：Jack demands that victor call off the mission.
杰克要求维克托放话出去，取消营救他的行动。