track·ball 
(trăkbôl′)
(trăkbôl′)n.
A ball mounted in a stationary housing and rotated to control a pointer on a computer screen.
| 单词 | trackball |
| 释义 | track·ball (trăkbôl′)n. A ball mounted in a stationary housing and rotated to control a pointer on a computer screen. |
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