工业废料更有害,因为其中有许多毒性很强的材料,如铜和铅。
Industrial waste is even more harmful since there are many highly poisonous materials in it, such as copper and lead.
不是发现过银和铅的混生矿吗?
但也一些含有巨毒,如苯和铅。
Others, though, were extremely toxic, such as benzene and lead.
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