1.pay for 赔偿；为…付钱

The chinese steel mills then pay for the shipping.
船运费将由中国的钢铁厂支付。

Taxpayers should not pay for bank failures.
纳税人不应该为银行的错误买单。

2.swap for 交换

Mourinho cheekily offered gallas to arsenal in a straight swap for cole this week.
这个星期老穆曾经提出想用加拉直接交换科尔。

So if you swap for the purposes of defense, you are also swapping for the purposes of rebounding.
所以如果你换了防守战术，那么抢篮板的战术也会不同。

3.thanks to 幸亏，多亏，由于

That is largely thanks to its impressive mobile-money revolution.
实在多亏了肯尼亚引人注目的手机钱包改革。

Pornographers are in bigger trouble, thanks to technology.
由于科技的作用，色情作品作者将陷入更大的麻烦。

4.need to 需要做

We need to stop trade protectionism.
我们需要制止贸易保护主义。

Three things need to happen.
我们必须做好三件事。