It is clear that the effects of these environmental pollutants are very real. 很清楚，这些环境污染物的影响是实际存在的。
Such diverse factors as toxic environmental contaminants, air pollution, and exposure to medical drugs are examined. 象有毒的环境污染物这样的完全不同的原素，空气污染和对医学药的暴露被检查。
