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重点讲解：
1. wipe out 摧毁；毁灭；使灭绝；
One dose of penicillin can wipe out the infection.
一剂青霉素就能消除感染。
2. be exposed to 使暴露于（险境）；使遭受（危险或不快）；
They had not been exposed to most diseases common to urban populations.
城市人口中多数常见的疾病他们都没有接触到。
3. be made of （由…）构成的；（由…）制成的；
The frame of an airship is made of light but strong metal.
飞船的框架是用轻而坚固的金属制成的。
4. shut down (使)(工厂、公司等)关闭,歇业，停业；
They shut down the nuclear reactor for safety reasons.
出于安全原因他们关闭了核反应堆。
adj. 暴露的，无掩蔽的，暴露于风雨中的 v. 暴露，
