在他们的研究中使用了光谱分析。 光谱分析原理是将天体光源通过光谱仪，通过光谱被减弱的程度，得出样品中元素含量。
They used spectroscopy for their analysis: a technique that breaks the light from celestial objects into a spectrum with telltale emission lines indicating which elements are present.
利用可见/近红外光谱检测技术对赣南脐橙总酸含量的无损检测进行了相关研究。
This research work was focused on using visible/near-infrared spectroscopy detection technology for measuring the total acidity of navel orange(Ganzhou, Jiangxi).
土壤中水分、有机质和氧化铁的含量对其光谱特征有很大影响。
The soil moisture, organic matter and iron oxide have a considerable effect on the red soil spectrum.
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