单词：roadblock 

名词

• 
  [1.n.roadblock] (同义词:[barrier( n. (阻碍通道的)障碍物, 栅栏, 屏障 )]  [roadblock( n. 障碍, 障碍物 )]  )
• 
  注释列句：any condition that makes it difficult to make progress or to achieve an objective; "intolerance is a barrier to understanding"
• 上位词 -> [obstacle( n. 障碍, 妨害物 )]  [hindrance( n. 妨碍, 障碍 )]  [difficulty( n. 困难, 难点 )]  [cognitive_factor]  [cognition( n. 认识 )]  [psychological_feature(心理特征 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 下位词 -> [ideological_barrier]  [language_barrier(n.语言障碍 )] 
  
• 
  [2.n.roadblock] (同义词:[roadblock( n. 障碍, 障碍物 )]  [barricade( v. 设路障 n. 路障 )]  )
• 
  注释列句：a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
• 上位词 -> [barrier( n. (阻碍通道的)障碍物, 栅栏, 屏障 )]  [obstruction( n. 阻塞, 妨碍, 障碍物 )]  [structure( n. 结构, 构造, 建筑物 vt. 建筑, 构成, 组织 )]  [artifact( n. 人造物品 )]  [whole( n. 全部, 全体, 整体, 完全之体系 adj. 所有的, 完整的, 完全的, 纯粹的, 未损伤的, 未打破的 adv. 完全, 整个 )]  [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 )]