Experts say testing needs to be done on each contaminant to determine the long-term effects on humans.

专家说需要对每种污染物进行测试，以查明对人类的长期影响。

《柯林斯英汉双解大词典》

Despite extensive research, their effects on humans are still poorly understood.

尽管以进行了大量研究，但它们到底对人类有多少影响还仍旧知之甚少。

youdao

History has also provided us with real-life examples of the same effects on humans.

历史也为我们提供了现实生活中在人类身体上所产生的相同效果的事例。

youdao

The Mars-500 mission at Moscow's Institute of Biomedical Problems will test the psychological and physical effects of long-term isolation on humans.

VOA: standard.2010.06.02

Those who maintain that the facility will represent a health hazard to its employees and individuals in the adjacent community have no supportable evidence of any detrimental effects on humans, plants or animals.

CENTERFORSECURITYPOLICY: Our Contribution To Glasnost

There are distinct similarities between the effects of lengthy space travel on humans and the effects of ageing on Earth.

BBC: What are the health risks of space travel?

If used in humans, these hybrid cells could have unknown effects on the body.

BBC: Stem cell research doubts