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Factoriesmustnowcleantheirwaterbeforeitisthrownaway,andtheymustn'tblowdirtysmokeint符合口语一点

题目详情
Factories must now clean their water before it is thrown away,and they mustn't blow dirty smoke int
符合口语一点
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答案和解析
工厂必须把污水净化,而后才可排出去.而且,也禁止工厂直接把烟尘排放进大气.