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optical system
earth.sc., life.sc.	sistema óptico
optical systems
astr.	sistemas ópticos

Optical System : 39 phrases in 15 subjects

Aviation	1
Communications	8
Cultural studies	2
Earth sciences	3
Electronics	4
General	1
Health care	1
Industry	2
Information technology	9
Radio	1
Technology	2
Thermal Energy	1
Transport	2
United Nations	1
Video recording	1