"Cov roj tseem ceeb" yog cov tshuaj molecules uas twb muaj nyob hauv cov nroj tsuag. Lub aroma ntawm tib tsob nroj txawv heev, tab sis nws tsis ntev-ntev. Feem ntau, nws tuaj yeem tawm yuav luag tsis muaj ntxhiab tsw li ntawm ob peb teev.
"Fragrance" yog cov tshuaj molecule uas tau dhau los ua ntau yam khoom siv. Tib cov tshuaj tsw qab tsis hloov ntau, thiab feem ntau nws tuaj yeem kav peb hnub.
"Nerfume" nyob ntawm seb cov chaw tsim khoom puas ntxiv cov roj tseem ceeb lossis cov tshuaj tsw qab, lossis ob qho tib si.