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.
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.
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.
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