length bar

例句：

1. 1. The length bar on the scale is marked in inches.
   秤上的刻度线是以英寸为单位的。
2. 2.The engineer used a length bar to measure the distance between the two points.
   工程师使用一根长度杆来测量两点之间的距离。
3. 3.The length bar was used to mark the starting point of the race.
   长度杆被用来标记比赛的起点。