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- 问题详情：Scientistshavehelpedpeopleunderstandthedangersfacingtheearth.Aspeopleliveontheearth,weshouldbefullyreadytodealwiththedangers.Ifwedonotpaymoreattentiontotheproblemscausedbyairpollution,ourearthmaynolongerbeahealthyplaceforplants,animals,andpeo...
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