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二重 性 : 29 phrases in 13 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Business | 6 |
| Earth sciences | 1 |
| Economy | 4 |
| Electronics | 3 |
| General | 1 |
| Genetics | 2 |
| Management | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Sports | 1 |
| Technology | 4 |
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