Tōngguò fēnxī pǔdài kěyǐ quèdìng huàhéwù de jiégòu.
By analyzing spectral bands, the structure of a compound can be determined.
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Spectroscopy term. 光谱 (guāngpǔ) is the spectrum as a whole; 谱带 is a single band within it. Often modified — 吸收谱带 (absorption band), 发射谱带 (emission band).
