1.military vehicle 军用车辆

例句：Establishment of the spectrum of the military vehicle transmission elements

军用车辆传动系零件载荷谱的建立

2.open-air 露天的

例句：Is the swimming pool here open-air or indoors?

这儿的游泳池是露天的还是室内的？

3.wrap up 圆满完成

例句：Let's wrap up the meeting before 5 o'clock.

咱们五点以前散会吧。

4.undercover agent 卧底

例句：Three years ago, a little painting caused big trouble for undercover agent Bob Wittman.

三年前，一幅小小画作给卧底鲍勃·惠特曼带来了大麻烦。