第三人称复数：plumb lines
名词铅垂线
1. 铅垂线：查尔斯达尔文(Charles Darwin )是证明有根植物都带有重力探测器第一位西方科学家:称为铅垂线(plumb line)[1]的重力方向线,它能有效地使植物产生向上或向下的感觉.
2. 铅锤线：plum 李子 | plumb line 铅锤线 | plumb rule 垂规
3. 铅垂;垂直线：plumb bob 锤球;测锤 | plumb line 铅垂;垂直线 | plumbing 水管装置
4. 铅垂线,重垂线：plumb level 水准仪,水平仪 | plumb line 铅垂线,重垂线 | plumb line deviation 垂线偏差
1. （检查垂直度的）铅垂线
A plumb line is a piece of string with a weight attached to the end that is used to check that something such as a wall is vertical or that it slopes at the correct angle.
noun
1. a cord from which a metal weight is suspended pointing directly to the earth's center of gravity
used to determine the vertical from a given point
Synonym: perpendicular