BMI大于30(或女性小于20)则意味着男性和女性生育力降低。
BMI greater than 30 (or less than 20 in women) is associated with decreased fertility in both men and women.
接触吸烟：长期接触吸烟已经显示降低男性和女性生育力。
Cigarette smoke exposure: Chronic exposure to cigarette smoke has been shown to decrease fertility in both men and women.
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