铅和铅的化合物破坏环境，有害人体健康。

Lead and Pb compounds have adverse health effects to human life and the environment.

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因此，当铅和硫以适当的比例结合在一起时，它们便形成了一种叫铅硫化物的化合物。

Thus, when the elements lead and sulfur are combIned In the proper proportion, they form a compound called lead sulfide.

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因此，当铅和硫以适当的比例结合在一起时，它们便形成了一种叫铅硫化物的化合物。

Thus, when the elements lead and sulfur are combIned In the proper proportion, they form a compound called lead sulfide.

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