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水环境污染,影响着人类的生活、生产,更直接影响水生动物的生存。如图1所示,是我国淮河流域的一鱼塘,经污水流入污染后,毒死成千上万条的鱼漂浮在水面,养鱼户日坐愁城,欲哭
Pollution of water environment affects human life and production and directly affects the survival of aquatic animals. As shown in Figure 1, it is a fishpond in the Huaihe River Basin in China. After polluted by polluted water, thousands of fish are poisoned to death and float on the surface of the water. Fish farmers are sitting in the city and crying.