由于作者没有绕线包的经验，这个变压器是完全手绕的。
Since the author had no experience with winding transformers, this transformer was wound by hand.
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.
机器人臂绕枢轴转动并伸直，好像伸出它的机械手。
It pivots around and straightens as it extends its mechanical hand.
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