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release spring |
安全弹簧 : 42 phrases in 13 subjects |
Architecture | 1 |
Chemistry | 3 |
Drilling | 1 |
Electronics | 1 |
General | 1 |
Hydroelectric power stations | 2 |
Metallurgy | 1 |
Nautical | 2 |
Oil / petroleum | 2 |
Refrigeration | 4 |
Shipbuilding | 2 |
Space | 1 |
Technology | 21 |