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A little more than half of the cohort lied in urban areas, one-quarter came from low-income families, 5% had a mother with asthma, and nearly all had siblings (90%). |
中文意思: 约超过一半的孩子居住在城市里,四分之一来自低收入家庭,5%的孩子的母亲患有哮喘,几乎所有的孩子均不是独生子(90%)。 |
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