In polluted urban areas, they also enhance production of ozone, a key ingredient of smog that is potentially toxic to animal and plant life.
在受污染的市区，他们还促进臭氧的产生，臭氧是对动物和植物生命有潜在毒性的烟雾的关键成分。
This is because man is also a social animal, all sorts of social forces could decide the fate of individuals, including his life and death.
这是因为人同时又是一种社会动物，种种社会力量都可能决定个人的命运，包括他的生与死。
This is because man is also a social animal, all sorts of social forces could decide the fate of individuals, including his life and death.
这是因为人同时又是一种社会动物，种种社会力量都可能决定个人的命运，包括他的生与死。
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