1、a plumb line attached to a narrow board
一種綁在一條窄木板上的鉛錘線。

2、Additional tools which will be required are metre stick plumb line and compass.
其他必須的工具包括米尺，鉛垂和羅盤。

3、a plumb line attached to a narrow board.
一種綁在一條窄木板上的鉛錘線。

4、The plumB line is always perpendicular to the horizontal plane.
鉛垂線總是垂直于水平面的。

5、adjust with a plumb line so as to make vertical.
用鉛垂線調整使得垂直。

6、Think of this as being a plumb line to find... used to find the direction of gravity.
假設這是鉛垂。，想想重力方向是怎樣的。

plumb line翻譯