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大气层外 dàqìcéng wài
space exoatmospheric
大气层外 dàqìcéng wài
space above the air
大气层外: 70 phrases in 12 subjects
Agriculture1
Air defense4
Aviation8
Electronics2
General7
Geophysics1
Oil / petroleum1
Refrigeration1
Space36
Technology4
United States4
Wind Energy1