结果表明，在受试样品中以镍精炼烟尘（取自火法处理硫化镍锍的镍精炼厂）的细胞毒性和吞噬活性为最强。

The results showed that both cytotoxicity of and phagocytosis activity to nickel refinery dust (from pyrometallurgical sulfide nickel matte refinery) were the strongest among the tested samples.

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由于硫化氢极强的毒性和腐蚀性，威胁着钻采生产过程中的每一个环节，极易发生事故。

Each link in the processes of drilling and production was threatened by the very high toxicity and corrosivity of hydrogen sulfide, which was extremely easy to cause an accident.

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