scroll-wheel

基本解释

One of the most useful innovations in pointing devices is the scroll wheel.
点操作设备上最有用的发明之一是滚轮，滚轮有多种，外形略有差异。
Use the scroll bars or scroll wheel on the mouse to move through the text.
使用滚动条或鼠标的滚动轮在整个文本中移动。
One would tend to believe a scroll wheel is just another scroll wheel.
一会倾向于相信一个滚轮，只不过是另一种的滚轮。
The fantastic thing about the scroll wheel is it allows users to avoid dealing with the challenges of interacting with scrollbars (see Figure 19-1).
滚轮的妙处在于使用者无须费力和难用的滚动条打交道（参见图19-1）。
Camera rotate and zoom functions are cleverly mapped to the mouse scroll wheel, allowing fluid access while using other tools.
摄像机旋转和缩放功能巧妙地映射到鼠标的滚动轮上，这样在使用其他工具时可以方便地使用这些功能。