先是有了滚轮鼠、然后橡皮球-可允许更平滑地移动，不过容易粘上污垢-现在有了给桌面拍照的微型照相机（译者：指光电鼠标）。

There were trackwheels, then rubber balls - which allowed smoother movement, but got gummed up with dirt - and now mini-cameras that film the table top.

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您可以在移动鼠标滚轮的同时，通过按ctrl键来放大或者缩小图表。

You can zoom in or out of a diagram by pressing the Ctrl key while moving the mouse wheel.

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JScrollPane组件甚至随预注册的侦听器一起提供，所以当这个组件获得焦点且用户移动鼠标滚轮时窗格将会滚动。

The JScrollPane component even comes with a pre-registered listener, so the pane will scroll when it has focus and the user moves the wheel.

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