1.Noise pollution 噪音污染

例句:Most of the cities were affected by light noise pollution.
多数城市受到轻度噪声污染。

2.A couple of 一对；几个

例句:Could you see your way to lending me 10 for a couple of days?
你能不能借给我10英镑过两天还你?

3.end up 结束

例句:Don't fiddle about with your typewriter; you could end up breaking it.
别瞎玩弄你的打字机；你会弄坏它的。

4.in effect 有效；实际上

例句:Initially the contract will be in effect for 3 years.
最初契约的有效期为三年。