You may have a circle of friends who provide constant good humor, help and companionship.

你可能会有一群朋友，他们幽默感十足，还会源源不断地给你带来帮助和陪伴。

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Outside the circle are two circles with multiplying incremental diameters, representing constant expansion of our business.

外由两个直径等倍递增的圆组成，象征着我们的事业不断扩散；

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Propagation characteristic of UHF radio wave in rectangle, circle and arched tunnels is studied in this paper and the computing equation for attenuation constant is deduced.

研究UHF频段的无线电波在矩形、圆形和拱形隧道中的传播特性，推导了衰减常数的计算公式。

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Whenever you see a particle moving in a circle, even if it's at a constant speed, it has an acceleration, v square over r directed towards the center.

只要看到质点做圆周运动,即使是匀速圆周运动,也存在一个加速度,大小为 v^2 / r,方向指向圆心

耶鲁公开课 - 基础物理课程节选