1. Any of various mixtures of xylidine isomers. 
   一种二甲基苯胺同分异构体的混合物
2. A bivalent organic radical, C6H4, derived from benzene by removal of two hydrogen atoms. 
   亚苯基一种二价的有机基因，c6h4，通过去掉两个氢原子，从苯中衍生
3. A chemical compound containing two sulfur atoms combined with other elements or radicals. 
   二硫化物含有两个硫原子与其他元素复合的化合物
4. Any of three isomeric compounds, C6H4(NO2)2, made from a mixture of nitric acid, sulfuric acid, and heated benzene and used in celluloid manufacture, in dyes, and in organic synthesis. 
   二硝基苯三种异构体中的任何一种，c6h4（no2）2，由硝酸、硫酸与苯形成。用于赛璐珞、染料与有机合成
5. curve of second degree 
   二次曲线

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• 1. diphenyl disulfide
  diphenyl diphenoxysilicane 二苯二苯氧基硅...diphenyl disulfide 二苯二硫...diphenyl ester 二苯酯
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