track-ball
英
[t'rækb'ɔːl]
美
[t'rækb'ɔːl]
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名词 trackball:
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an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen
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用作名词 (n.)
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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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