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蜉蝣集体“袭击”大桥，是灾难预警还是水污染严重？
湖南常德汉寿沅水大桥遭蜉蝣集体“袭击”。桥面像下雪一样，铺满蜉蝣。为啥会出现这种现象？灾难前兆还是河水污染严重？（出品：科普中国-创作培育计划）
创作培育计划71/100
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