请帮忙翻译,谢谢 !When we work-and also when we play-we use up energ
请帮忙翻译,谢谢 ! When we work-and also when we play-we use up energy.The energy may be physical or mental or a combination of the two.When our work or play is prolonged,we become tired and want to stop and rest or change to some other activity.If we do not stop,we become gradually less efficient.