According to the American Lung Association, 35 percent of American children live in homes where regular smoking occurs.

根据美国肺脏协会，35%的美国儿童的家庭中有人经常吸烟。

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The proportion of the children who took up regular smoking was greater among those whose mothers had smoked during the pregnancy than among those whose mothers had not.

怀孕期间吸烟母亲的孩子以后吸烟的人数比例远远超过怀孕期间不吸烟母亲的孩子。

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The proportion of the children who took up regular smoking was greater among those whose mothers had smoked during the pregnancy than among those whose mothers had not.

怀孕期间吸烟母亲的孩子以后吸烟的人数比例远远超过怀孕期间不吸烟母亲的孩子。

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