2. justify vt.证明…有理; 为…辩护
例句：He tried to justify his absence with lame excuses.
他想用站不住脚的借口为自己的缺席辩解。
3. existence n. 存在
例句：He does not believe in the existence of ghosts.
他不相信有鬼存在。
4. pledge vt. 保证给予;许诺;发誓
例句：He pledged never to come back until he had found her.
他发誓不找到她决不回来。
5. inform vt.告诉, 通知
例句：I informed his wife of his safe arrival.
我通知他太太他已平安抵达。
6. facilitate vt. 促进
例句：The new airport will facilitate the development of tourism.
新机场将促进旅游业的发展。
7. accompany vt. 随着...发生,伴有
例句：Thunder often accompanies lightning.
雷声常伴着闪电。
8. uncertainty n.无把握;不确定;变化不定；无把握、不确定的事物
例句：Her comments will add to the uncertainty of the situation.
她的批评将会使局势更加不稳定。
9. sensitive adj. 需要小心处理(以免引起麻烦或冒犯)的, 敏感的, 微妙的
例句：This is such a sensitive issue that perhaps the press should not be told.
这是个十分敏感的问题, 恐怕不该让新闻界得知。
10. replace vt. 代替，取代
例句：Trams are being replaced by the buses.
电车正在被公共汽车所代替。
