食品药监局并未为许多自牛肉中发现的药物、农药和重金属元素设立“容忍标准”——包括铜元素和砷元素在内，这些添加物可以促进牛只生长及杀灭某种寄生虫。

FDA has not set a "tolerance level" for many of the drugs, pesticides and heavy metals found in beef, including copper and arsenic, which can promote growth and inhibit certain parasites.

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通过系统分析二阶寄生极点，提出了解决这类电路高频自激的方法。

A simple approach based on an analysis of the location of second-order parasitic poles is used to suppress the self-sustained high frequency oscillations usually found in these circuits.

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本文是作者自1973年以来，在云南各地对鱼类寄生甲壳动物进行调查采集的初步整理。

The present paper deals with preliminary systematic revision on survey to parasitic Crustacea in Yunnan, China, conducted since 1973. Altogether 130 species of fishes were examined.

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