barrier
/ˈbɛriər/
a structure or object that impedes free movement
中文释义：障碍物；屏障
The concrete barrier prevented vehicles from entering the pedestrian zone.
混凝土屏障阻止车辆进入步行区。
Language can be a significant barrier to effective communication.
语言可能成为有效沟通的重大障碍。