Definition: the border of an area within a country Level: C2
我们越过了州界线进入新墨西哥州。
We crossed the state ___line into New Mexico.
这条河作为两个地区之间的县界线。
The river serves as the county ___line between the two districts.
新的开发项目一直延伸到城市边界。
The new development project extends right up to the city ___line.
