一项研究表明，每天哪怕只抽10支烟也会损害生育能力。
One study showed that even as few as ten cigarettes a day can damage fertility.
一项美国的研究也发现了一些证据证明，二手烟吸烟者占不吸烟者人数的60%。
One US study found evidence of secondhand smoke in 60 percent of non-smokers.
一项美国的研究也发现了一些证据证明，二手烟吸烟者占不吸烟者人数的60%。
One US study found evidence of secondhand smoke in 60 percent of non-smokers.
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