They use a trackball to move the cursor and scroll the screen, but it is more like cursor-key functionality rather than a mouse pointer.
它们使用轨迹球移动指针和滚动屏幕，但是这更像是指针-键功能而不是鼠标指针。
You should position your cursor before right clicking, because most of the functions in the pop-up menu use the position of the cursor before you pressed the right mouse button.
在右击之前你应该首先决定鼠标指针的位置，因为在弹出式菜单中的大部分功能都是在光标位置附近而被触发实现。
For example, you might use the track bar to control the cursor blink rate or mouse speed for a system.
例如，可以使用跟踪条来控制系统的鼠标速度或光标闪烁频率。
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