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多约束 : 22 phrases in 13 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Business | 2 |
| Computer networks | 2 |
| Corporate governance | 1 |
| Cryptography | 1 |
| Economy | 1 |
| Electronics | 2 |
| General | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 6 |
| Telecommunications | 1 |
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