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free-expansion | |||
free swell | |||
free expansion |
自由膨胀 : 20 phrases in 10 subjects |
Aviation | 2 |
Bridge construction | 1 |
Chemistry | 1 |
Electronics | 1 |
Engineering geology | 3 |
Explosives and Explosive Ordnance Disposal | 2 |
General | 1 |
Mechanics | 2 |
Metallurgy | 3 |
Technology | 4 |