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.

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。

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This study aims to set up the emphysematous model, and find a kind of drug to inhibit the development of emphysema and the way in which the drugs play the roles;

在肺气肿的发生中弹力酶失衡是主要学说之一，本研究旨在利用弹力酶建立地鼠肺气肿模型，寻找防治肺气肿的药物及探讨其作用环节；

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