boundary line

名词 boundary line:

1. a line that indicates a boundary
   同义词：border, borderline, delimitation, mete

1. The boundary line of a figure, area, or object.
   周围一个图形、区域或物体的边界线
2. A long narrow trench or furrow dug in the ground, as for irrigation, drainage, or a boundary line.
   沟渠，排水沟，水道在地面上狭长的沟渠或细沟，用于灌溉、排水或用作分界线