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管道 系统 : 59 phrases in 17 subjects |
| Aviation | 2 |
| Combustion gas turbines | 2 |
| Construction | 3 |
| Ecology | 1 |
| Electronics | 5 |
| Environment | 1 |
| General | 23 |
| Medical | 1 |
| Missiles | 1 |
| Nautical | 2 |
| Oil / petroleum | 2 |
| Oil and gas | 2 |
| Oil processing plants | 1 |
| Oilfields | 1 |
| Technology | 10 |
| Thermal engineering | 1 |
| United Nations | 1 |
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