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| 双扇门中先开启的门扇 | |||
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opening door : 54 phrases in 9 subjects |
| Architecture | 1 |
| Automobiles | 9 |
| Aviation | 4 |
| Hydroelectric power stations | 1 |
| Nautical | 3 |
| Plastics | 1 |
| Rail transport | 3 |
| Shipbuilding | 6 |
| Technology | 26 |
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