plumb line

音标发音

For me these meditations are like a plumb line dropped by a master builder — to see if the walls are straight or crooked.
对我来说这些冥想就像一条建筑工人吊的铅垂线 — 来检查墙壁是否垂直。
This article gives an easy way in which laser plumb line is set up by means of He-Ne laser in space with the liquid level as the base.
本文叙述以液面为基准面，用小型氦-氖激光器在空间建立激光垂直线的简易方法。
Total lumbar lordosis, thoracic kyphosis, sacral slope, and C7 plumb line were measured on the pre- and postoperative whole spine lateral views.
在术前、后全脊柱侧位片测量腰椎总前凸、胸椎总后凸、骶骨倾斜度和颈7铅垂线。

Ben Kingsley, now sixty, is in great shape—his carriage is so erect that you could drop a plumb line from the back of his bald crown to his heel.
NEWYORKER: House of Sand and Fog

a piece of string with a weight attached to one end, used either to test if something vertical, such as a wall, is exactly straight, or to find the depth of water

A plumb line is a piece of string with a weight attached to the end that is used to check that something such as a wall is vertical or that it slopes at the correct angle.