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.

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。

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As an example, say you have an item that you want to move in a circular orbit around the screen.

例如，假设想要有一个在屏幕中沿着圆形轨迹运动的项。

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An ocean wave passing through deep water causes a particle on the surface to move in a roughly circular orbit, drawing the particle first towards the advancing wave.

穿过深水的海浪使水面上的一个微粒按照一种近乎圆形的轨道移动，先把微粒拉向前移动的海浪。

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Move further down and you'll see a tiny, circular speaker grille on the left and three pin connectors for an optional wireless charging cover.

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And late last year, when the commerce ministry issued a circular instructing Saudi companies to use Arabic for all their domestic correspondence a move designed to encourage the hiring of Saudis rather than non-Arabic-speaking Asians the companies dodged by substituting Egyptians for Indians, Lebanese for Filipinos.

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