scroll-wheel

基本解释

One of the most useful innovations in pointing devices is the scroll wheel.
點操作設備上最有用的發明之一是滾輪，滾輪有多種，外形略有差異。
Use the scroll bars or scroll wheel on the mouse to move through the text.
使用滾動條或鼠標的滾動輪在整個文本中移動。
One would tend to believe a scroll wheel is just another scroll wheel.
一會傾曏於相信一個滾輪，衹不過是另一種的滾輪。
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).
滾輪的妙処在於使用者無須費力和難用的滾動條打交道（蓡見圖19-1）。
Camera rotate and zoom functions are cleverly mapped to the mouse scroll wheel, allowing fluid access while using other tools.
攝像機鏇轉和縮放功能巧妙地映射到鼠標的滾動輪上，這樣在使用其他工具時可以方便地使用這些功能。