词汇讲解：
1. siren n.汽笛, 警报器
例句：In big cities you always hear sirens all the time.
在大城市里, 你总能听到警笛声。
2. roar vt. 咆哮, 怒吼; 大声喊出
例句：He was too excited and roared himself hoarse.
他过于激动, 嗓子都喊哑了。
3. degenerate vi. 衰退; 堕落; 退化
例句：He denied that some young people today were degenerating.
他否认现在某些青年在堕落。
4. rampant adj. ( 坏事) 泛滥的；猖獗的
例句：Sickness was rampant in the rural areas of this country.
这个国家的农村地区疾病流行。
5. loot v. 抢劫, 掠夺
例句：The mob looted many shops in the area.
暴徒在该地抢劫了许多商店。
6. prompt vt. 促使, 推动, 引起
What prompted him to be so generous?
例句：是什么原因使得他如此大方呢?
7. scope n. (处理、研究事务的)范围
例句：Such subjects are not within the scope of this book.
这样的问题不在本书的讨论范围之内。
8. activate vt.使活动, 起动, 触发
例句：We must activate the youth to
study.
我们要激励青年去
学习。
9. recall vt.召回, 收回
例句：Recall your messenger.
召回你的使者。
10. schedule vt.排定, 安排
例句：The secretary is trying to schedule the month's appointments.
秘书正在设法安排这个月的约会。
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