...最基本的事件处理文件和定义文件练习10-2：添加直线运动事件(1inear move)的处理代码练习10-3：添加圆弧运动事件(circular move)的处理代码练习10-4：添加快速运动事件(rapid_move)的处理代码练习10-5：添加initial move和first_move事件的处理代码练习10-6：...
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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。
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。
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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