combinational band
谱带组 set of bands
组合谱带 combination band
组合振动＜谱＞带 combinational vibrational band
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相对强度上，两个方向上第一组的谱带强度相当；第二组、第三组谱带强度平行方向明显强于垂直方向。
The intensity of the first band is equivalent in two directions, while the second and the third parallel toc-axis are much stronger than the vertical.
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