boundary line

界线, 边线

例句与用法：

The boundary line of a figure, area, or object.

周围一个图形、区域或物体的边界线

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