Sensitive areas on the screen can be just a couple of pixels across because you can assume that the user is established comfortably in his chair, arm positioned in a stable way on his desk, rolling his mouse firmly across a resilient mouse pad.

• 在屏幕上仅用少量像素就可以来设置一些敏感的操作区域，因为这时用户的使用环境通常都是很稳定而舒适的。 即坐在椅子上，手臂稳稳地放在桌子上，在略有弹性的鼠标垫上稳定地滚动鼠标。