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算术 和 : 13 phrases in 10 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 2 |
| Electronics | 1 |
| General | 3 |
| Mathematics | 1 |
| Multimedia | 1 |
| Telecommunications | 1 |
| United States | 1 |
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