The plumB line is always perpendicular to the horizontal plane.

铅垂线总是垂直于水平面的。

Additional tools which will be required are metre stick plumb line and compass.

其他必须的工具包括米尺，铅垂和罗盘。

Hull floors being fitted and checked for alignment with a centreline plumb line.

赫尔楼正在安装和检查调整，以中心线铅垂线。

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。

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。