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double wedge | |||
folding wedges |
双楔 : 38 phrases in 12 subjects |
Automobiles | 2 |
Aviation | 4 |
Chemistry | 2 |
Electronics | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 2 |
Hydroelectric power stations | 2 |
Oil / petroleum | 2 |
Rail transport | 1 |
Space | 1 |
Technology | 19 |
Wind Energy | 1 |