BBC news 2010-04-10 加文本

turn up出现

例句：He didn't turn up until half an hour later.
      半小时后他才出现。

2.Unveiling one of the new machines at a ceremony celebrating what Iran calls a nuclear day, President Mahmud Ahmadinejad said no one could stop his country from producing peaceful nuclear energy.

prevent...from,keep...from还有stop...from 这三个句式的意义都是：阻止……做……或阻止某事的发生，而protect...from是表示保护

……不受伤害

prevent...from 和stop……from 用在主动语态中from可以省略。
keep...from在表示此意时，from不可以省略。keep。。。doing 是使。。。处在。。。状态中的意思。
prevent...from,keep...from还有stop。。。from 这三个句式中from后面的动词与from前面的词构成动宾关系时，后面用动名词的被动形式。

We must prevent the water from being polluted.
我们必须防止水被污染。

What stopped him from coming here?
是什么阻止他来这里的呢？

3.The BBC's Tehran correspondent says the new technology will worry the west as it could speed up Iran's ability to make a nuclear bomb.

speed up(使)加速

例句：We'll never get there if he doesn't speed up.
      如果他不快些走, 我们一定到不了那里。

      We are speeding up the mechanization of our agriculture.
      我们正在加快农业机械化的步伐。

4.In a statement, al-Shabab said the BBC had been broadcasting the agenda of crusaders and colonialists against Muslims and ordered all the organization' transmitters to be shut down.

shut down完全关闭，倒闭，停止运转

例句：The shop has shut down because of lack of trade.
      那商店因生意萧条而停业。