1.happen to vt. 發生(碰巧,正巧,偶然)

例句：
We happen to hold the same view.
我們兩人的想法不謀而合。

2.in the first place adv.首先

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

3.be old enough to 已經是...年齡了

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

4.have no choice but... 非...不可, 除...之外別無他法

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

5.zero in on (使)瞄準... (使)對準...對...集中火力

例句：
The plane zeroed in on the arms factory and destroyed it with one bomb.
飛機瞄準了兵工廠，一顆炸彈就把它炸毀了。

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.
我真想擺脫對這項工作的責任，但是看來沒有合適的人可以交出去。