词汇讲解：
1. communicable adj. 可以传授的,会传染的
例句：Some communicable diseases are transmitted only through the agency of insects.
某些传染病只通过昆虫来传播。
2. spread v. (使)传播, (使)散布
例句：Flies spread disease.
苍蝇传播疾病。
3. leading adj. 重要的, 主要的
例句：She is one of the leading writers of her days.
她是那个时代主要的作家之一。
4. diet n. 日常饮食，日常食物, 规定饮食
例句：You should go on a diet.
你应该节食。
5. exaggeration n. 夸张,夸大
例句：It would be a bit of an exaggeration to say that I’m desperate to leave.
说我渴望离开是有点夸张。
6. impending adj. 即将发生的;迫在眉睫的
例句：We were well aware of impending disaster.
我们清楚地意识到即将来临的灾难。
7. obesity n. 肥胖;过胖
例句：Sugar and fat can more easily lead to obesity than some other foods.
糖和脂肪比其他食物更容易导致肥胖。
8. prevention n. 防止；预防；防范
例句：Prevention is better than cure, so start looking after your heart now.
防病比治病好，所以从现在开始照顾好你的心脏。
9. amount n. 量, 数量, 数额
例句：Large amounts of money were wasted.
浪费了大量的钱。
10. preventive adj. 预防的,防止的
例句：The situation brings home to us the need for drastic preventive actions.
这种情况使我们深切地感到采取极端的预防行动是必要的。
11. high-level adj. 高阶层的,高级的
例句：We have a growing habit of high-level exchanges on world problems and on bilateral issues.
我们就世界和双边问题举行高级会谈已日益形成习惯。
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