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。
Conclusions In 4 M-H culture medium products, only the products produced by 2 companies are qualified, 3 dry powders on the market are not fit for preparation of M-H culture medium.
结论所抽的4种品牌成品培养基中只有2种M H培养基质量符合要求，市售3个品牌的水解酪蛋白干粉不适合制备m H培养基。
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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