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系统观察
busin.
systematic observation
系统观察:
55 phrases
in 16 subjects
Air defense
1
Athletics
1
Aviation
19
Cartography
1
Earth sciences
1
Electronics
4
General
1
Geophysics
2
Metallurgy
1
Name of organization
5
Nautical
1
Space
2
Technology
13
Textile industry
1
Thermal Energy
1
United Nations
1
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