BBC news 2009-11-17 加文本

1.The news came as Russia pulled a brake on its involvement with Iran's nuclear program, delaying the startup of a nuclear power station that's built in southern Iran.

pull a brake on暂停，限制

例句：They had to put a brake on the economy.
      他们不得不限制经济发展的速度。

2.Russia has a key role to play in the growing crisis.

have a key role to play扮演者关键角色，起着关键作用。相当于Play a key role

3.But he said he was not satisfied with it, as it did not include targets either for the amount of spending on agriculture or a date to eradicate hunger in the world.

either or不是...就是..., ...或...

例句：Even the weather is either beautiful or horrible.
      连天气都变成了或美丽或恐怖。

      Tom is going to buy either a guitar or a piano.
      汤母不是要买一把吉他就是要买一架钢琴。