plumb line

• n. 铅垂线；测铅线

英英释义

Noun:

1. a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point

例句

用作名词 (n.)

1. The plumB line is always perpendicular to the horizontal plane.
   铅垂线总是垂直于水平面的。

近反义词

【近义词】

• perpendicular 垂直的