The Sun (and anything warm) is constantly emitting infrared, and the Earth absorbs it and turns the energy into atomic and molecular motion, or heat.
太阳（和其它任何热的物体）持续辐射红外线，地球吸收红外辐射，并将它转换为原子或分子的运动，即热。
The energy, dissipated in this way, will finally appear as energy of molecular motion or heAT.
以这种方式损失的能量最终表现为分子的动能或热能。
It is impossible to have a cyclic machine that completely converts the random molecular energy of heat flow into the ordered motion of mechanical work.
不可能得到一种循环机器能把热流的无序的分子能量完全转变为机械功的有序运动。
Thus heat, according to this picture, is not a special form of energy different from the mechanical one but is just the kinetic energy of molecular motion.
根据这种想象，热不是与机械能不同的一种特殊形式的能，其实它就是分子运动的动能。
Thus heat, according to this picture, is not a special form of energy different from the mechanical one but is just the kinetic energy of molecular motion.
根据这种想象，热不是与机械能不同的一种特殊形式的能，其实它就是分子运动的动能。
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