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graded-index
el.	梯度折射率
tech.	缓变折射率
graded index
el.	★ 缓变折射率
space	渐变折射率; 梯度折射率

graded-index : 67 phrases in 15 subjects

Agriculture	1
Aviation	1
Communications	1
Electricity	1
Electronics	18
Geophysics	1
Information technology	5
Materials science	3
Physics	1
Polymers	2
Rail transport	1
Securities	1
Space	3
Technology	22
Telecommunications	6