词汇讲解：
1. epidemic n. 流行病; 泛滥，蔓延
例句：The Sanitary Board tries to stamp out the epidemic.
卫生局试图消灭这种流行病。
2. orphan n. 孤儿
例句：When his parents were killed in an accident, he became an orphan.
当他的父母在事故中丧生之后, 他便成了孤儿。
3. affect vt. 影响
例句：The tax increases have affected us all.
加税已经影响了我们所有的人。
4. mental adj. 精神的, 头脑的, 心理的, 智力的
例句：He has some mental problems.
他有心理上的问题。
5. anxiety n. 焦虑, 担心, 不安
例句：There's a lot of anxiety among the staff about possible job losses.
工作人员都很忧虑, 担心可能失业。
6. homicide n. 杀人
例句：The jury returned a verdict of justifiable homicide.
陪审团作出了正当杀人的裁决。
7. stigma n. 耻辱, 瑕疵
例句：It's a stigma to ask for money.
要钱是一种耻辱。
8. exclude vt. 排除; 不包括在内;不放在考虑之列
例句：Closing the windows excludes street noises.
关窗使街上吵闹的声音不能进来。
9. spread vt. (使)传播, (使)散布
例句：Flies spread disease.
苍蝇传播疾病。
10. absolutely adv. 确实地；肯定地
例句：All the car parks are absolutely full.
所有的停车场都停满了车。
11. effective adj. 有效的; 生效的
例句：These are effective measures.
这些都是有效的措施。
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