The difficulty in distinguishing variable species is largely due to the varieties mocking, as it were, other species of the same genus.

变异的 物种所以难于区别，主要在于变种和同属中其他物种相象的缘故。

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Such anomalies are due to the relative abundance of the "isotopes" or varieties of each element.

这种反常现象是由于同位素比较丰富或者各个元素比较多样化。

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Through an analysis on the varieties of toxicants we discovered that most of the intoxication are due to organophosphorus pesticides, cyanides, poisonous plants and animals.

毒物种类以有机磷农药、氰化物和有毒动、植物中毒最多见，与欧美等国家比较有显著差别。

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