A 2002 Justice Department study suggested that more than1.6 million American juveniles run away or are kicked out of their home each year.
从历史上看,大多数公共健康主要是促进中度至剧烈强度的有氧体力活动(例如快走或慢跑)。
Historically, most public health physical activity recommendations have predominantly promoted moderate to vigorousintensity aerobic physical activity(such as brisk walking or jogging).
家长不会教自己的孩子爬、走或者跑,他们都是自己摸索。
Parents don't teach their children to crawl, walk, or run; they figure it out on their own.
适度的活动被定义为更剧烈的运动,如游泳、快走或每周跑步两到三个小时。
Moderate physical activity was defined as a more intense exercise such as swimming,brisk walking, or running two to three hours a week.
适度的活动被定义为更剧烈的运动,如游泳、快走或每周跑步两到三个小时。
The researchers defined moderate exercise as activities such as swimming, runningor walking briskly for at least two to three hours a week.
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