1. The plumber used a plumb to ensure the pipe was installed vertically.
水管工使用铅锤来确保管道垂直安装。
2. They decided to plumb the depths of the ocean to study its ecosystems.
他们决定探测海洋的深处，以研究其生态系统。
3. The building's walls were perfectly plumb, indicating excellent construction.
建筑物的墙壁垂直完美，显示出出色的构造。