例句與造句

1. Development of the research on aroma compositions of tobacco and the precursor substances
   煙草香味物質(zhì)及其形成的前體物質(zhì)研究進(jìn)展
2. 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
   介紹了煙草及煙氣中香味物質(zhì)的分離、分析、鑒定的基本方法和技術(shù)以及研究成果，并對(duì)形成煙草香味的前體物質(zhì)進(jìn)行了探討。
3. It's difficult to find precursor substance in a sentence. 用precursor substance造句挺難的