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. 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
3. Any of a family of industrial compounds produced by chlorination of biphenyl, noted primarily as an environmental pollutant that accumulates in animal tissue with resultant pathogenic and teratogenic effects. 
   聚氯联二苯一种工业化合物，由二苯经氯化作用而产生，被认为是一种环境污染物质，积聚在动物组织中，能导致病原体和产生畸形生长

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• 1. 联苯基乙醛
  biphasic || 两阶段的...biphenyl acetaldehyde || 联苯基乙醛...biphenyl || 联苯
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