n.[C]

1. 障碍物；路障，栅栏
   The police put up barriers to control the crowd.

   警察设置障碍物，借以控制人群。

2. 障碍，阻碍[（+to）]
   They soon overcame the language barrier.

   不久他们便克服了语言上的障碍。

3. 界线[（+between）]
4. 剪票口；海关关卡
   Mike was stopped at the barrier because he forgot to show his ticket.

   麦克在剪票口被拦住了，因为他忘记出示车票。

n.

▸an obstacle to communication, understanding, or progress:

a language barrier.