单词：old_boy_network 

名词

• 
  [1.n.old_boy_network] (同义词:[old_boy_network(n. 校友关系（网） )]  )
• 
  注释列句：an exclusive informal network linking members of a social class or profession or organization in order to provide connections and information and favors (especially in business or politics); "professional women have developed an old boy network of their own"
• 上位词 -> [network( n. 网络, 网状物, 广播网 )]  [system( n. 系统, 体系, 制度, 体制, 秩序, 规律, 方法 )]  [group( n. 团体, 组, 团, 群, 批, [地]界, [化]基 v. 聚合, 成群 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )]