Arsenic, a kind of microelement, is widespread in nature. Excessive arsenic has bad effects on human health.

砷是一种广泛分布于自然界的微量元素，砷过量会危害人类的健康甚至致癌。

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Objective To control the hazardous effects of excessive arsenic in drinking water on human health.

目的防治饮用水中过量砷对人体健康的危害。

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Endemic arsenic poisoning is one of the endemic diseases which can seriously damage people's health, and researchers are paying more and more attentions to its immune effects.

地方性砷中毒是一种严重危害人群健康的地方病，有关砷中毒对免疫系统影响的研究亦越来越受到人们的重视。

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