... beexperiencedat 对……有经验 be engagedin参与；从事于；忙于 beoccupiedwith忙于，专心于 ...
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be engagedin
是从事
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Finally, let him know that he will be allowed to indulge in his favoritehigh-calorie treats, such as ice cream and cookies, only after he has engagedin an appropriate amount of exercise.
最后要让他知道只有当他完成了足量的运动之后，才能享受他那些心仪的高卡路里食物，像冰激凌啊，大餐啊之类的。
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