precursor substance meaning in Chinese

产物母体, 先质, 前身物质

Development of the research on aroma compositions of tobacco and the precursor substances
烟草香味物质及其形成的前体物质研究进展
In this article , the basic method and technology of separating , analyzing and identifying aroma compositions and research achievements of flavor substances were introduced , precursor substances that form aroma compositions were explored
介绍了烟草及烟气中香味物质的分离、分析、鉴定的基本方法和技术以及研究成果，并对形成烟草香味的前体物质进行了探讨。