在老鼠和人的尿中经常可发现这种化学品的痕迹，科学家们不知道这药物是自然产生的还是从实验对象使用的某种东西中带来的。
Traces of the chemical are often found in mouse and human urine, leading scientists to wonder whether the drug is being made naturally or being delivered by something the subjects consumed.
有机食品依照像其他法规一样的生产标准控制化学品在作物生产中的使用和药物在动物生产中的使用。
Organic foods are produced under standards that control the use of chemicals in crop production and medicine in animal production, among other regulations.
有机食品依照像其他法规一样的生产标准控制化学品在作物生产中的使用和药物在动物生产中的使用。
Organic foods are produced under standards that control the use of chemicals in crop production and medicine in animal production, among other regulations.
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