目标速度影响鼠标、食指操作追踪球和拇指操作追踪球等指点装置的操作可控性、稳定性和疲劳度。
Target speed has an effect on the operating controllability, stability and fatigue degree of mouse, and the index finger operating and thumb operating trackballs.
屏幕上的拇指轮看上去就像鼠标上的滚动轮，行为也非常相似，并普遍用在某些三维程序中。
Onscreen thumbwheels look rather like the scroll wheel on a mouse, and behave in much the same way.
要是你用拇指来代替食指敲击鼠标键的话，效果会更好的。
If you use your thumbnails to click your mouse buttons instead of your forefingers, you get a much better result.
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