他描述甲烷为一种相当险恶的气体，它不仅是一种强烈的温室气体，而且会增加地面上的臭氧污染，危害人体健康。
He described it as an insidious gas; one that is not only an intense greenhouse gas but one that also helps create ground-level ozone, which is damaging to human health.
病不仅造成养猪业巨大的经济损失，而且严重危害人体健康。
Cysticercosis contributes to great economic loses in the pig-raising industry and threatens human health seriously.
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