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拆换 : 31 phrases in 14 subjects |
Agriculture | 1 |
Automobiles | 2 |
Aviation | 4 |
Business | 1 |
Chemistry | 1 |
Economy | 1 |
Electronics | 3 |
General | 2 |
Metallurgy | 1 |
Mining | 2 |
Shipbuilding | 2 |
Space | 2 |
Technology | 8 |
Wind Energy | 1 |