Be aware of the volume control during the activity to avoid any disturbance to classes.
活动时避免声浪过大，以免影响他人上课。
The other half includes the often large volume of non-exercise physical activity.
而另一半的时间又有绝大多数是非运动型的活动。
The other half includes the often large volume of non-exercise physical activity.
而另一半的时间又有绝大多数是非运动型的活动。
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