plumb

/pləm/

the metal bob of a plumb line

中文释义：铅锤；测深锤

The builder used a plumb to ensure the wall was perfectly vertical.

建筑工人用铅锤确保墙壁完全垂直。

A plumb line is essential for checking the alignment of a structure.

铅垂线对于检查结构的对齐至关重要。