二者在甲苯、乙烷的碳同位素组成，氮气和汞蒸气含量等方面存在着一定的差异。
They are different from each other in toluene contents, the carbon isotope composition of ethane and the nitrogen and mercury vapor contents, etc.
在中国的主要沙漠和戈壁等粉尘源区采集了地表沙或土壤（统称为表土）样品，分析了样品的碳酸盐含量和碳酸盐的碳氧同位素组成。
Surface soil samples were collected in the deserts and Gobi regions of China. The carbonate content and carbon and oxygen isotopic composition were analyzed.
硼含量和硼同位素组成有正相关关系。
The result reveals that there is positive relationship between boron content and boron isotopic composition.
在烃类天然气中，由于稀有气体的含量很微，所以其同位素组成的检测相对较困难。
The measurement of the noble gas isotopes in hydrocarbon natural gases is relatively difficult because their content is very low.
即不同金管之间气态烃的相对含量和碳同位素组成差异很小。
The proportional and carbon isotopic compositions of hydrocarbon and non-hydrocarbon gases are almost identical among these gold capsules.
李世珍 肖应凯 研究员 ：本文系统而简要地介绍了硼的分离纯化，硼含量和硼同位素组成的测定。
Abstr act: In this study, the methods of preparation and isotopic measurement of boron are introduced systematically and briefly.
李世珍 肖应凯 研究员 ：本文系统而简要地介绍了硼的分离纯化，硼含量和硼同位素组成的测定。
Abstr act: In this study, the methods of preparation and isotopic measurement of boron are introduced systematically and briefly.
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