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火箭推进 huǒjiàn tuījìn
space rocket propulsion
火箭推进
: 101 phrase in 14 subjects
Air defense2
Aviation13
Chemistry3
Earth sciences1
Electronics4
Explosives and Explosive Ordnance Disposal1
General14
Military1
Skydiving1
Space55
Technology1
Transport1
United Kingdom1
United States3