1. a pungent colorless unsaturated liquid aldehyde made from propene. 
   一种无色、气味刺激的不饱和液态醛，由丙烯制成。
2. An anhydride formed by the removal of a water molecule from the hydroxyl and carboxyl radicals of hydroxy acids. 
   内酯一种通过从酸的羧基中除去一个水分子而形成的脱水物
3. a sweet crystalline aldehyde formed by the breakdown of sugars. 
   一种甜味的晶状醛，由糖分解形成。
4. a monosaccharide sugar that contains the aldehyde group or is hemiacetal. 
   含有乙醛基或其半缩醛的单糖。
5. Any of a class of monosaccharide sugars containing an aldehyde group. 
   醛糖，醛式糖含有醛类的单糖中任意一种

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