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Spektren n stresses
opt.	спектры; спектр
Spektrum n -s, ..tren
phys.	спектр

Spektren: 40 phrases in 16 subjects

Astronomy	3
Automated equipment	1
Computers	1
Electronics	1
Geology	7
Mathematics	4
Medical	2
Medical appliances	4
Mining	1
Natural resourses and wildlife conservation	1
Nuclear and fusion power	1
Optics branch of physics	2
Quantum electronics	1
Radio	1
Technology	5
Радиоактивное излучение	5