1. an oily colorless liquid obtained by the condensation of two molecules of acetaldehyde. 
   一种无色的油质液体，浓缩两个乙醛分子而获得。
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 colorless liquid polymer, C6H12O3, of acetaldehyde, used as a solvent and a sedative. 
   仲（乙）醛，三聚乙醛一种用作溶剂和镇定剂的无色液体聚合物，c6h12o3

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• 1. 乙醇醛
  hydroxyunsaturatedacid不饱羟基酸...hydroxy-acetaldehyde乙醇醛...hydroxyacetanilide羟基乙酰苯胺
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