单词：rabbit_hole 

名词

• 
  [1.n.rabbit_hole] (同义词:[rabbit_burrow]  [rabbit_hole]  )
• 
  注释列句：a hole in the ground as a nest made by wild rabbits
• 上位词 -> [hole( n. 洞, 孔, 突破口 v. 凿洞 )]  [natural_depression]  [geological_formation(地质层组, 地质组成 )]  [object( n. 物体, 目标, 宾语, 对象 vi. 反对, 拒绝, 抗议 vt. 提出...来反对 )]  [physical_entity]  [entity( n. 实体 )]