1.kill off 消灭

Their natural predators have been killed off.
它们的天敌被全部杀死。

It is an effective treatment for the bacteria and does kill it off.
这是杀菌的特效药，能将其全部消灭。

2.prepare for 为…作准备

It is only prudent to prepare for the consequences.
为由此带来的后果做准备是谨慎之举。

Now is the time to prepare for the worst.
现在就应该为最坏的状况做准备。

3.based on 以…为依据

Some think the answer is pay based on annual individual performance.
一些人认为答案在于基于个人年度业绩支付薪酬。

International development actors are making judgments based on erroneous statistics.
国际发展研究人士根据错误的统计数字作出判断。

4.spend up 把钱花光

Gabra women in northern kenya spend up to five hours a day carrying heavy jerry cans filled with murky water.
在肯尼亚北部的加布拉妇女花费5个小时，每天背着沉重的杰里与黑暗蓄水罐。

Mr wade can spend up to four hours perfecting his dirt drawings but admitted one heavy downpour could destroy his hard work.
wade先生愿意花上4个小时的时间来完善他的尘垢画作，却不得不容忍他的大作会被一场倾盆大雨彻底毁掉。