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汉语拼音：yuán zhōu

在平面上，一动点以一定点为中心，一定长为距离而运动一周所形成的轨迹。

1. 数学名词。在平面上，一动点以一定点为中心，一定长为距离而运动一周的轨迹，叫做圆周。简称圆。

• All points on a circle are equidistant from the centre.

  圆周上各点离圆心的距离相等。

• Any two diameters of a circle intersect each other.

  圆周内两直径必相交.

• The diameter and the circumference of a circle correlate.

  圆的直径与圆周有相互关系.

• The earth's circumference is about 25,000 miles.

  地球的圆周约为25,000英里.

• Both men had just begun to swim towards the shore, when they noticed with dismay that the speed - boat was moving in a circle.

  这两个人刚刚开始向岸边游去, 这时他们突然惊愕地看到快艇正在作圆周运动.

• The compressor - outlet pressure is nearly constant around the circumference.

  压气机出口压力沿圆周方向接近于常数.

• The radial displacement must be accompanied by a circumferential force.

  径向位移必须伴有圆周力.

• The doctrine of uniform circular motion became embedded in Greek thought.

  匀速圆周运动的信念已深入希腊人的思想中.

• The circular movement of this crank operates the valves register.

  曲柄的圆周运动带动了阀门的记录器.

• There are many examples of circular motion in nature.

  自然界中有许多做圆周运动的例子.

• The concept of a single circular frequency breaks down in certain instances.

  在某些情况下,单一的圆周频率的概念就行不通了.

• The earth's circumference is nearly 25,000 miles.

  地球的圆周约为25,000英里.

• The natural motion of heavenly objects is circular.

  天上的物体的自然运动是圆周运动.

• The resulting motion is again circular.

  合成的运动仍是圆周运动.

• The direction is normal to the line of centers, i . e. motion is circumferential.

  该方向垂直于中心连线, 即运动是沿圆周方向的.