单词：track-ball
track-ball的用法和样例：
例句
- Input devices include keyboards and pointing devices such as mouse,joystick,track ball, or light pen.输入设备包括键盘和点击设备如鼠标，操纵杆，跟踪球或光笔。
词汇搭配
- track ball pointer转球式(光标)指示器...
- ball track球沟道,轴承滚道...
- track rod ball plug横联杆球塞
- track ball跟踪球
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