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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。
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