n.[C]

1. 障礙物；路障，柵欄
   The police put up barriers to control the crowd.

   警察設置障礙物，藉以控制人群。

2. 障礙，阻礙[（+to）]
   They soon overcame the language barrier.

   不久他們便克服了語言上的障礙。

3. 界線[（+between）]
4. 剪票口；海關關卡
   Mike was stopped at the barrier because he forgot to show his ticket.

   麥克在剪票口被攔住了，因為他忘記出示車票。

n.

▸an obstacle to communication, understanding, or progress:

a language barrier.