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。
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实用英语
Stacy's Blackberry stopped working properly. The trackball wouldn't scroll up. She took her phone to the Verizon store. A worker said, You need a new phone. We'll send you one. Then we'll transfer your contacts to it. Several days later, Stacy took h
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