污染元素
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hg-element pollution 汞污染
trace element pollution 微量元素污染
heavy element pollution 重金属污染
poisonous element pollution 有毒元素污染
heavy metal element pollution 重金属污染
·2,447,543篇论文数据，部分数据来源于NoteExpress
The FCX, on the other hand, runs on the world's most plentiful element--hydrogen--and doesn't produce any of the pollution that today's gasoline-powered cars do.
FORBES: Fueling Hope
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