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transportation system : 96 phrases in 21 subjects |
| Artificial intelligence | 2 |
| Automobiles | 3 |
| Aviation | 19 |
| Business | 2 |
| China | 4 |
| Communications | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 7 |
| International trade | 1 |
| Management | 4 |
| Metallurgy | 2 |
| Navigation | 1 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 2 |
| Rail transport | 1 |
| Remote sensing | 1 |
| Shipbuilding | 1 |
| Space | 16 |
| Technology | 23 |
| United States | 3 |
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