请输入您要查询的英文单词：
单词
ˈplumb ˌline
释义
ˈplumb ˌline
NOUN
C
a piece of string with a metal object fixed to the bottom , used for checking whether a wall is straight or for measuring the depth of water （测量墙体是否竖直或水深的）铅垂线，重锤线