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利用加速度的定义和曲率圆的概念较简单地推导出了一些曲线运动中加速度的公式，并得出一些重要结论。
This paper helps briefly derivate a general acceleration formula of curvilinear motion with an acceleration definition and the concepts of curvature circle, and obtains an important conclusion.
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In other words, you don't have to be moving actually in a circle to have the acceleration.
也就是说,你不必真的在一个圆上运动以获得相应的加速度
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