1. terrorist n. 恐怖主义者,恐怖分子,恐怖分子
例句:One American was killed and three were wounded in terrorist attacks.
在几起恐怖袭击中,一名美国人遇难,三人受伤。
2. strengthen vt.加强,巩固; 勉励,激励
例句:You cannot strengthen the weak by weakening the strong.
削弱强者不能使弱者变得强壮。
3. expand vt.扩张; 使…变大; 详述
例句:Engineers noticed that the pipes were not expanding as expected
工程师注意到管道并没有如预期那样膨胀。
4. investigation n.侦查; (正式的) 调查,研究
例句:We are making a thorough investigation
我们正在进行彻底调查。
5. threaten vt. 危及; 恐吓; 预示(某事)
例句:He said army officers had threatened to destroy the town
他说陆军军官们曾威胁要摧毁那座小镇。