The machines are single molecule motors that can spin at about 3 million rotations a second when a blue light shines on them.

这些机器是单子，蓝光照射到机器上时，它可以每秒三百万转的速度旋转。

The final design can spin at 125,000 revolutions per minute – which is over two thousand spins a second!

最终设计可以到每钟125,000转——也就是每秒超过两千转！

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，我们还谈到了匀速周运动的频率：它是弹珠每秒转的圈数，等于 1 除以周期。

Within each hundredth of a second, the sensors see 12 pulses of light, and using the generated pulse train, the processor calculates that the wheel is spinning at 25 rotations a second, and then sends this information to the computer.

在每一百之一秒内，传感器会看到12次光脉冲，然后通过生成的脉冲序列，处理器计算出滚轮以每秒25转的速度旋转，并将这一信息发送给计算机。