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速 度密度 : 36 phrases in 11 subjects |
| Automobiles | 4 |
| Aviation | 3 |
| Earth sciences | 3 |
| Electric machinery | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 4 |
| Nuclear physics | 1 |
| Space | 1 |
| Steel production | 1 |
| Technology | 16 |
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