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观察系统
tech. observing system; surveillance system; viewing system
textile visual review system
观察 系统: 52 phrases in 16 subjects
Air defense1
Athletics1
Aviation19
Business1
Cartography1
Earth sciences1
Electronics4
General1
Geophysics2
Metallurgy1
Name of organization5
Nautical1
Space2
Technology10
Thermal Energy1
United Nations1

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