1.happen to vt. 发生(碰巧,正巧,偶然)

例句：
We happen to hold the same view.
我们两人的想法不谋而合。

2.in the first place adv.首先

例句：
How did life arise in the first place?
生命最初是怎样起源的？

3.be old enough to 已经是...年龄了

例句：
He is old enough to be her father and rich enough to be her husband.
他老足以当伊之父、富足以当伊之夫。

4.have no choice but... 非...不可, 除...之外别无他法

例句：
Then we would have no choice but to intervene.
那就非干预不行。

5.zero in on (使)瞄准... (使)对准...对...集中火力

例句：
The plane zeroed in on the arms factory and destroyed it with one bomb.
飞机瞄准了兵工厂，一颗炸弹就把它炸毁了。

6.hand over v.移交

例句：
I should like to get rid of the responsibility for this job, but there doesn't seem to be anyone fit to hand over to.
我真想摆脱对这项工作的责任，但是看来没有合适的人可以交出去。