First, we'll examine two different technologies used to measure the direction and speed of rotation, and after that, we'll see what causes some to have a stepped or clicking motion versus spinning smoothly.
首先， 我们将研究用于测量旋转方向和速度的两种不同技术，然后， 我们将了解是什么导致某些技术具有阶梯或点击运动而不是平滑旋转。