: On the one hand, due to the large number of people and clutter, so that all kinds of people will join the swimming venue smelting water, on the other hand, due to the increase in the area exposed in the air, so that the body surface pollutants also increased accordingly, coupled with high temperature, easy to sweat, into the pool water easily shed and dissolved, so that the pollution of the pool water becomes very serious
正在翻譯中..
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