Let this be the angle d theta so it moves in a short amount of time over an angle d theta dS and the arc here is dS, R and the radius is R.

这是角度dθ,它运动了一会儿,运动过角度dθ,弧度是，半径是。

youdao

Since you know the velocity of the transmitter from this ratio since you know the period, R which is this, you now also find the radius R.

既然根据这个比例,知道了发射机的速度,既然你们知道了周期，就是这个，也就知道了半径。

youdao

Therefore, the larger the dog's body radius (R) is, the stronger these forces are on the dog's skin.

因此，小狗身体的半径越大，它皮肤表面的离心力就越强。

youdao

And one common way to think about it, is to think about the value of r, or the radius, below which 90% of that electron density is going to be contained.

而通常的想法，是想象，r，的值，也就是半径的值，即有百分之九十的电子密度,都落在这个范围之内。

麻省理工公开课 - 化学原理课程节选

and a radius R and that's where your particle is.

半径为 R,这就是质点的位置

耶鲁公开课 - 基础物理课程节选

We call that a node, r and a node, more specifically, is any value of either r, the radius, or the two angles for 0 which the wave function, and that also means the wave function 0 squared or the probability density, is going to be equal to zero.

节点就是指对，于任何半径，或者，两个角度,波函数等于，这也意味着波函数的平方或者概率密度,等于，我们可以看到在1s轨道里。

麻省理工公开课 - 化学原理课程节选