hard border
noun[C]
uk/ˌhɑːd ˈbɔː.dər/us/ˌhɑːrd ˈbɔːr.dɚ/aborderbetweencountriesthat isstronglycontrolledandprotectedbyofficials,police, orsoldiers,ratherthan one wherepeopleareallowedtopassthrougheasilywith fewcontrols:
（国家之间）设有边防的边界，硬边界Introducing a hardborderbetween the twocountriescouldaffecttourism.在两国之间引入设防边界可能会影响旅游业。
Territorial boundaries
- border
- bound
- boundary
- bourne
- checkpoint
- frontier
- no-man's-land
- passport control
- state line
- the Iron Curtain
- the Mason-Dixon Line
- transboundary