不仅正统 DNA 被冲洗走了，污染源也被冲洗了进来。
Not only is the authentic DNA getting washed out, but contamination is getting washed in.
铝矿冶炼过程会产生一种有毒的"红色污泥"，如果它们被冲洗进河流时会带来严重污染。
The process by which it is refined also produces a toxic "red sludge", which can cause serious pollution if it washes into streams and rivers.
经自然雨水冲洗尘埃不沾，能有效地防止污染。
The natural rained dust not touch, can effectively prevent the pollution.
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