In 1983 a doctor notices "black raindrops" on patients' skin-a sign of arsenic poisoning (lesions are another).
在1983年，一个医生在病人皮肤上注意到了一些“黑色覆盆子”——这时砷中毒的标志(真正的伤不会是这样的)。
Investigation of arsenic content in black soil of Yushu city in Jilin province was carried out, and the affecting factors were analyzed.
调查了吉林省榆树市黑土与玉米中的砷含量，并分析了其影响因素。
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