The heart rate of children who slept eight hours was two beats per minute slower than that of kids who slept only seven hours.
睡眠八小时的孩子心率比睡眠七小时的孩子每分钟慢两次。
The heart rate of children who slept eight hours was two beats per minute slower than that of kids who slept only seven hours.
睡眠八小时的孩子心率比睡眠七小时的孩子每分钟慢两次。
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