| 释义 |
plumb STRAIGHTplQmadj [after v; not gradable]specialized (esp. of something vertical) exactly straight垂直的When you hang a door, you need to make sure that it is both level and plumb.装门的时候，必须保证门是平直的。If something is out of plumb, it is not exactly straight.不垂直的A plumb line is a piece of string with a weight fixed to one end, which is used either to test whether something that is vertical, such as a wall, is exactly straight, or to find the depth of water.铅锤线
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