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free to contract and expand |
自由胀 : 25 phrases in 12 subjects |
Aviation | 3 |
Bridge construction | 2 |
Chemistry | 1 |
Electronics | 1 |
Engineering geology | 3 |
Explosives and Explosive Ordnance Disposal | 3 |
General | 1 |
Mechanics | 2 |
Metallurgy | 3 |
Polymers | 1 |
Technology | 4 |
Wind Energy | 1 |