He says changing the mechanical kinetic energy into electrical energy is easy.
他说，机械动能转化为电能是非常容易的。
Kinetic energy can be converted back to potential energy, can be converted back, - but the sum of them — which we call "mechanical energy" — is conserved.
动能可以转化，成为势能，也可以转化为动能，但是总和-，我们叫做的，机械能，是恒定的。
Then we have the conservation - of mechanical energy — the sum of kinetic energy and potential energy.
我们知道，机械能守恒定律-，动能和，势能的总和。
Notice that not all mechanical energy is kinetic energy.
要注意，并非所有的机械能都是动能。
The main difficulty with a quantum mechanical on-particle interpretation is the occurrence of states with negative (kinetic) energy.
描写粒子的量子力学性主要困难是负(动能)能量状态的出现。
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。
It transforms electromagnetic energy into mechanical energy (kinetic energy), driving load by electromagnetic force acting.
它把电磁能转换成机械能(动能)，借电磁力做功，传动载荷。
It transforms electromagnetic energy into mechanical energy (kinetic energy), driving load by electromagnetic force acting.
它把电磁能转换成机械能(动能)，借电磁力做功，传动载荷。
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