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optical section
avia. 光纤段
desert. 光切面
tech. 光学切面; 光学截面
optic section
tech. 光学切面; 光学截面; 光切面
optical section: 23 phrases in 9 subjects
Air defense1
Aviation2
Communications4
Electronics5
Hydroelectric power stations1
Information technology3
Rail transport1
Space1
Technology5