border
US /ˈbɔːr.dɚ/
UK /ˈbɔːr.dɚ/

1.
边界, 边境
a line separating two countries, administrative divisions, or other areas
:
•
The river forms a natural border between the two nations.
这条河构成了两国之间的天然边界。
•
Customs officials are stationed at the border crossing.
海关官员驻扎在边境口岸。