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| unit-ball | |||
| sphere of radius; unit ball | |||
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单位球 : 24 phrases in 10 subjects |
| Agriculture | 3 |
| Animal husbandry | 1 |
| Aviation | 5 |
| Dermatology | 1 |
| Earth sciences | 2 |
| General | 1 |
| Space | 3 |
| Sports | 2 |
| Surgery | 1 |
| Technology | 5 |
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