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optical system
earth.sc., life.sc.	système optique
IT, earth.sc.	bloc optique

optical system: 65 phrases in 18 subjects

Aviation	1
Communications	9
Computers	3
Cultural studies	3
Earth sciences	3
Electronics	5
General	6
Health care	1
Industry	2
Information technology	17
Medical appliances	5
Natural resourses and wildlife conservation	2
Natural sciences	1
Radio	1
Telecommunications	2
Transport	2
United Nations	1
Video recording	1