他们认为，充足的体育锻炼应该是每周五天进行半小时的适量运动，或是每周三天进行20分钟的激烈运动，或者对这两者进行适当结合。
They considered sufficient physical activity to be 30 minutes of moderate exercise five days a week, 20 minutes of vigorous exercise three days a week, or some combination of the two.
他们认为，充足的体育锻炼应该是每周五天进行半小时的适量运动，或是每周三天进行20分钟的激烈运动，或者对这两者进行适当结合。
They considered sufficient physical activity to be 30 minutes of moderate exercise five days a week, 20 minutes of vigorous exercise three days a week, or some combination of the two.
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