分析了采用半角转动法求中心点和圆周点以进行四杆机构综合的原理和方法。

The principle and method for quarto-rod can be analyzed as a device simply through rotation of the half Angle so as to find the central and circular points.

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通过在卵形表面(20)的纵向轴线的区域的圆周点(12)上施加侧向压力，出口(21)可被打开到可变宽度。

The outlet (21) can be widened in a variable manner by lateral pressure on circumferential points (12) in the region of the longitudinal axis of the oval face (20).

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圆周上各点离圆心的距离相等。

All points on a circle are equidistant from the centre.

《牛津词典》

We're describing the motion of a particle in a circle.

我们描述了圆周上一个点的运动

耶鲁公开课 - 基础物理课程节选