Experts caution that the harmful effect of fog on our health is often concealed.
译文：专家提醒说，雾对人体健康的危害有很大的隐蔽性。
Among the causes that lead to inferior health, harmful life style and various pressures have the leading effect.
在导致亚健康的诸多原因中，不良生活方式和各种压力起着主导作用。
There was no obvious harmful effect on the workers' health in the underground semi-closed circumstance for a rather short time staying.
地下半密闭环境在短期内对人员健康无明显不良影响。
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