Animal studies have confirmed that high doses are harmful, but some evidence that it may also be harmful at low doses has yet to convince regulators to take decisive action against the compound.

动物研究已经确认高剂量的双酚a是有害的。低剂量也可能存在危害，但是还没有足够的证据让监管部门下定决心对这种化学物质采取措施。

youdao

The team is working towards producing a biofuel that USES human and animal excretion, with the hopes of replacing harmful gasoline, diesel and jet fuel that dominate the market.

这个研究小组正在用人和动物的排泄物生产生物燃料。他们希望以此替代目前占据市场主导地位但却有害的汽油、柴油和喷气燃料。

youdao

In traditional toxicology a single chemical is tested in one cell or animal to assess its harmful effects.

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。

youdao

There is no evidence that they are harmful to human or animal life.

NEWYORKER: The Invasion from Outer Space

Drug concentrations in water are not thought to be harmful to human health, although concerns remain over possible effects on plant and animal life.

BBC: University studies drug residue pollution in water