铅垂线总是垂直于水平面的。

The plumB line is always perpendicular to the horizontal plane.

赫尔楼正在安装和检查调整，以中心线铅垂线。

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

当墙与铅垂线标准相一致时，木匠才满意，他说这才是对的。

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.”

输入层分别为小车的位移和速度、摆杆偏离铅垂线的角度和角速度。

Input layer is respectively the displacement and speed of car, the Angle and Angle speed between pendulum bar and vertical line.

本文概述了地方铅垂线变化震前异常的原因、监测网的建立、研究进展以及展望。

The paper outlines the cause of anomalous local plumb-line variations before earthquakes; the establishment of monitoring networks; the progress and prospect of research.