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重点讲解：
1. keep sb./sth. at bay 使…不能靠近；防止…侵袭；
Eating oranges keeps colds at bay.
吃橘子可以预防感冒。
2. take care of 照顾；照看；看护；
I take care of them to the best of my abilities.
我尽我所能地照顾他们。
3. be made of （由…）构成的；（由…）制成的；
All the bedding is made of simple, untreated cotton.
所有床上用品全部用未经处理的天然棉花制成。
4. get exposed to 接触；
We don't operate dangerous machinery, or get exposed to toxic chemicals.
我们并没有从事危险的机械操作，或接触有毒的化学物质。
vt. 推进，提高，增加
n. 推进，增加
