Recently he has been caught sleeping during the classes.
最近他上课睡觉被逮住。
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。
Some classes may be held during the summer holidays.
部份课堂可能安排于暑假期间进行。
They only deliver dinner, because they all have classes to attend during the day.
因为白天要上课，所以她们只送晚餐。
They only deliver dinner, because they all have classes to attend during the day.
因为白天要上课，所以她们只送晚餐。
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