the track of a wheel

Unlike the operation of a track wheel on a mouse, reading an article from top to bottom on the Mactraption requires an upwards movement on the trackpad instead of a downwards one.

从上到下读一篇文章，需要向下滑动鼠标上的滚轮，使用MacBook操作方法却不同，需要在触控板上向上滑动。

互联网摘选

And a slide mode control is designed to control the brake moment in this thesis so that the vehicle can track the optimal wheel slip. The effectiveness of this method is verified by the result of simulation.

文中进一步设计了一个滑模控制器控制刹车力矩，使车辆保持对最佳滑移率的跟踪，仿真结果表明这种方法的有效性。

互联网摘选