This swing in  voltage is then used to determine rotational speed and angular distance travelled.

然后，该电压摆动用于确定转速和行进角距离。

On one occasion Malm saw a young fish raise and depress the lower eye through an angular distance of about seventy degrees.

有一次，Malm 看到一条小鱼以大约 70 度的角距离抬起并压下下眼。

All of the points along each spoke have to have the same angular velocity, because they all cover the same angular distance in the same amount of time.

每个辐条上的所有点都必须具有相同的角速度，因为它们在相同的时间内都经过相同的角距离。

Then, using the difference  in angles and the time between measurements, the mouse determines the speed, angular distance  travelled, and direction of movement, and sends it to the computer.

然后， 利用角度差异和测量之间的时间，鼠标确定速度、行进的角距离和移动方向，并将其发送到计算机。

The information is not speed, however, but  rather, the angular distance measured in degrees and the direction the scroll wheel has travelled  every hundredth to a thousandth of a second.

然而， 信息不是速度，而是以度为单位测量的角距离和滚轮每百分之一到千分之一秒行进的方向。

This angular distance and direction can then be  used by the operating system and its software to know how far up or down to move in a website  or application.

然后，操作系统及其软件可以使用这个角距离和方向来了解在网站或应用程序中向上或向下移动的距离。