Mandy B. Belfort, M. D. , M. P. H. , of Boston Children's Hospital, and colleagues examined the relationshipsofbreastfeeding duration and exclusivity with child cognition at ages 3 and7years.
波士顿儿童医院的贝尔福特博士与她的同事研究了母乳喂养时间分别与3岁、7岁时儿童认知能力的关系。
Just walk, at a reasonably vigorous clip (3 m. p. h. - 4 m. p. h.) for half an hour or so, maybe five or six times a week.
就以适度有力的步伐(每小时3 ~ 4英里)走上半个小时左右，每周五六次。
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