Some chemical materials may volatile poisonous gas and some chemical leavings may produce pollution.

某些化工材料物品可能挥发有毒气体，一些化工残渣可能发生净化；

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Some chemical materials may volatile poisonous gas and some chemical leavings may produce pollution.

某些化工材料物品可能挥发有毒气体，一些化工残渣可能发生净化；

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