It should be possible to deduce the velocity from the number of revolutions at which the light goes through both wheels.

应该可以从光穿过两个轮子的转数推断出速度。

It's the number of revolutions the marble makes around the ring every second, and it's equal to 1, divided by the period.

它是球绕环行进的转数 每秒，等于一，除以轮数。

Now, we’ve also talked about the frequency of uniform circular motion: It’s the number of revolutions the marble makes around the ring every second, and it’s equal to 1, divided by the period.

现在，我们还谈到了匀速圆周运动的频率：它是弹珠每秒绕圆环转的圈数，等于 1 除以周期。