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What appeared to the earlier physicists to be the constant quantity of heat is nothing more than the whole motive power of the motion of heat, which remains constant so long as it is not transformed into other forms of work, or results afresh from them.
在早期的物理学家看来，热量是恒定的，但它只不过是热量运动的全部原动力。只要热量不转化为其他形式的功，也不重新转化为其他形式的功，它就保持不变。