In short, heat flows from the warmer to the cooler body.
总之，热总是从高温物体流向低温物体。
Heat never flows spontaneously from a cooler to a hotter body.
热决不会自发地从低温物体流向高温物体。
In the past some people thought that heat was a fluid, because it can flow from a hot body to a cooler one until both are at the same temperature.
在过去，一些人认为热是流体，因为它能。一个热的物体流到一个较冷的物体，一直到这两个物体温度相同为止。
In the past some people thought that heat was a fluid, because it can flow from a hot body to a cooler one until both are at the same temperature.
在过去，一些人认为热是流体，因为它能。一个热的物体流到一个较冷的物体，一直到这两个物体温度相同为止。
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