1. (警方或军队设置的)路障
When the police or the army put a roadblock across a road, they stop all the traffic going through, for example because they are looking for a criminal.

1. a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.

Synonym: barricade

2. any condition that makes it difficult to make progress or to achieve an objective

e.g. intolerance is a barrier to understanding

Synonym: barrier