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| tracking ball | |||
| traceball | |||
| trace ball; trackball | |||
| tracer ball | |||
| track ball | |||
| tracker ball | |||
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| track ball; trackball | |||
| 跟踪 球: 33 phrases in 10 subjects |
| Agriculture | 1 |
| Air defense | 2 |
| Aviation | 4 |
| Business | 1 |
| Earth sciences | 3 |
| Electronics | 2 |
| General | 2 |
| Space | 12 |
| Technology | 4 |
| United States | 2 |
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