It is clear that the effects of these environmental pollutants are very real. 很清楚，這些環境污染物的影響是實際存在的。
Such diverse factors as toxic environmental contaminants, air pollution, and exposure to medical drugs are examined. 象有毒的環境污染物這樣的完全不同的原素，空氣污染和對醫學葯的暴露被檢查。
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