The boundary or limit of a country.

(一个的)边界。

The most remote settled part of country, facing an unexplored region.

(靠近未开发地带的)边缘地区。

The farthermost limits (of knowledge).

(常用复数)(知识的)极限。

Pertaining to, or situated near, the boundary of a country.

边垂的；边塞的。