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换轨 : 45 phrases in 10 subjects |
| Astronautics | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Bridge construction | 4 |
| Earth sciences | 1 |
| Electronics | 2 |
| Rail transport | 5 |
| Space | 6 |
| Steel production | 1 |
| Technology | 22 |
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