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About half of this cadmium is released into rivers through weathering of rocks and some cadmium is released into air through forest fires and volcanoes. 大約有一半的鎘通過(guò)石頭的風(fēng)化流入到江河里，還有的隨著森林火災(zāi)和火山爆發(fā)流入空氣中。