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observation system
space 观测系统
tech. 监测系统
observation systems: 105 phrases in 19 subjects
Agriculture1
Air defense2
Aviation20
Business2
Cartography2
Desert science2
Earth sciences16
Ecology2
Electronics9
Environment1
General1
Geology2
Information technology1
Remote sensing1
Space16
Technology21
United Nations3
United States1
Wind Energy2

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