故在本篇研究中，我们想去调查乳酸是否会对人类皮肤角质细胞产生细胞毒性作用。
In this study, we investigated the cytotoxic effect of lactic acid on human keratinocyte cell line.
甲基汞在环境中分布广泛，可以对人类的生活产生威胁，故对甲基汞的研究具有重要意义。
Methylmercury widely exists in the environment, which threatens the life of human beings. So, it is very significant to research the behavior of methylmercury.
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