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活塞发动机 huósāi fādòngjī
skydive. piston motor
tech. piston engine
活 塞 发动机: 54 phrases in 11 subjects
Automobiles18
Aviation6
Compressors1
Construction1
General1
Metallurgy1
Oil / petroleum1
Shipbuilding1
Skydiving2
Space3
Technology19