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。
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.
因此它可以把“两倍于电源频率的直流电”进行“平滑化处理”，成为一个接近恒定的直流电。
Therefore it can be seen that it will "smooth" the "twice mains frequency DC" into a near constant DC voltage.
谷歌涂鸦让这些成为可能——它是谷歌网站上恒定的变化元素。
The Google Doodle makes this possible - it's the change that is constant on Google. com.
谷歌涂鸦让这些成为可能——它是谷歌网站上恒定的变化元素。
The Google Doodle makes this possible - it's the change that is constant on Google. com.
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