1.in response to 回应，响应
He always takes the lead in response to the government's call.
他总是带头响应政府的号召。
2.set off 引起，使爆炸
The powder immediately ignited and set off a chain reaction of explosions.
炸药立即点燃并引发了连环爆炸反应。
3.be willing to 乐意做某事
We are looking for students who would be willing to assist in school newspaper.
我们正寻找愿意协助校报工作的学生。
4.as far as 就……而言
As far as I can gather, he got involved in a fight.
据我了解，他卷入了一场争斗之中。
5.engage in 从事于（参加）
The kinds of trade nations engage in are varied and complex, often a mixture of visible and invisible trade.
国家从事的贸易种类是多样的、复杂的，往往是有形贸易和无形贸易的混合。
