Think of this as being a plumb line to find... used to find the direction of gravity.

假设这是铅垂。，想想重力方向是怎样的。

youdao

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。

youdao

when a carpenter is satisfied that the walls are straight and aligned with the standard of the plumb line, he says that they are “true.”

当墙与铅垂线标准相一致时，木匠才满意，他说这才是对的。

youdao

An Egyptian astronomer would have held up a plumb line and waited for the night sky to slowly pivot around the unmarked pole as the Earth rotated.

BBC: Pyramids lined up with the stars

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