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They are generally made by a reaction between nitric acid and an organic compound.
一般都是由硝酸与一种有机化合物反应生成。
youdao
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The nitric acid changed the cuticle of his mouth to a yellow color.
硝酸将他口腔里的护膜变成了一种黄颜色。
youdao
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The nitric acid changed the cuticle of his mouth to a yellow color.
硝酸将他口腔里的护膜变成了一种黄颜色。
youdao