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有时效的 : 23 phrases in 11 subjects |
Aviation | 1 |
Bridge construction | 1 |
Business | 4 |
Communications | 1 |
Economy | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 3 |
Project management | 6 |
Space | 1 |
Technology | 2 |
Telecommunications | 2 |