这句话的“平衡”是指把学习和休息相互矛盾两个方面进行合理安排，应该意译为“合理调配学习和休息时间”或“在学习和休息方面有效地利用时间”如：
He has learned how to distribute the time to both of his study and hisrelax in reason. （in reason意思是“合理地”）
He has learned how to deploy his hours to study and relax. (deploy意思是“有效地利用”)
He has learned how to balance study and rest.
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