很多人认为地球绕太阳的轨道是完美的圆形，就像手在一块制作精良的手表上移动那样平滑、有规则，但事实并非如此。
A lot of people think of earth's orbit around the sun as being perfectly circular, as smooth and as regular as, say, the way that hands move on a well-made watch, but it just doesn't work that way.
如何移动对象在道路的同时绕自身轴线旋转它？
How to move object in a path while rotating it around its own axis?
促使电子绕电路移动的力被叫做电动势。
The force that causes electrons to move around a circuit is called electromotive force.
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