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在自然界中所发生的过程有一个现象的本质是长期以来为许多自然科学家们所不明瞭的:为什么热总是由高温物体传向低温物体,而相反的过程在任何时候都不能直接观察到呢?
The nature of a phenomenon that occurs in nature has long been unknown to many natural scientists: why heat is always transmitted from high temperature objects to low temperature objects, and the opposite process can not be directly observed at all times ?