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有一天下午你随父亲去河边钓鱼，发现河水污染。只钓到小鱼，河水被污染的原因？倘若全国的河水都被污染！后果如何？希望在不久翻译成英语

One day afternoon you go fishing by the river with the father, found the water pollution. Only catch fish, the river is the causes of the pollution? If the water is polluted. What the consequences

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