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They surveyed the children about their TV watching and video game habits, and they had each child wear a pedometer for at least four days in order to gauge his or her typical physical activity level.
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释义
他们调查儿童看电视及打电动的习惯,他们亦在每个儿童身上装设步数计,为期最少四天,以测量他们的活动水平。
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