[分化]
first order spectrum
... 自旋系统：spin system 一级光谱：first order spectrum 二级光谱(二级图谱)：second order spectrum ...
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短语
第一级光谱
first order spectrum
;
spectrum of first order
;
primary spectrum
光谱一级序区
first-order region
一级导数光谱
first derivative spectrum
-
first-order spectrum
first-order spectrum
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