而在环境危害的研究中，你需要测试许多化学品的混合物、各种剂量、不同的时间点和不同的年龄段——从怀孕到童年到老年。
In studying environmental hazards one needs to test mixtures of many chemicals across ranges of doses at different points in time and at different ages from conception to childhood to old age.
在传统的毒理学中，评估单一化学品有害影响的测试是在一个细胞或一种动物身上进行的。
In traditional toxicology a single chemical is tested in one cell or animal to assess its harmful effects.
研究发现该用于塑料和金属的化学品能通过95%的美国测试。
Studies have found the chemical, used in plastics and metal can linings, in 95% of Americans tested.
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