Unlike a passive solar home, an active solar home uses mechanical equipment, such as pumps and blowers, and an outside source df energy to help heat the house when solar energy is not enough.

与消极供暖房屋不同的是，积极供暖房屋使用机械设备，比如泵、风箱，以及外部的能量源，以保证太阳能不足时也可以给房屋供暖。

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James Joules The physicist James Joules, after we we call after him the unit of work was the first to demonstrate that heat energy and mechanical energy are really equivalent.

物理学家，我们以他命名功的单位,他是第一个演示出,热能和机械能相等的人。

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Nuclear energy can be converted into heat, and that can be converted into mechanical energy and again into electricity.

核能也可以转化为热量，能转化为机械能，再转成电力。

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You're always wasting energy into heat somewhere when you dochange that involves mechanical change.

当进行与机械运动有关的变化时,总会有能量变成热量而被浪费掉。

麻省理工公开课 - 热力学与动力学课程节选