铅锤线

例句：

1. 1. The engineer drew aplumb line to mark the center ofthe room.
   工程师画了一条铅垂线来标记房间的中心。
2. 2. The construction worker useda plumb bob to ensure thewall was perfectly level.
   建筑工人使用铅垂球确保墙壁完全水平。
3. 3. The architectmeasured the angle between the two walls usinga plumb line.
   建筑师用铅垂线测量了两个墙之间的夹角。