The speed of the mouse is the ratio between how many pixels the cursor moves on the screen and how many centimeters you move the mouse on the mouse pad.
鼠标的速度是游标在屏幕上经过了多少像素与鼠标在鼠标垫上移动了多少厘米之比。
When you wake up someday, if you find the mouse pointer comes form the screen to your mouse pad, don't surprise, it is not the dream.
有天你醒来，发现鼠标指针从电脑屏幕上跑到了鼠标垫上，可千万别惊讶，这不是梦。
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