convergence gage

例句：

1. 1.The convergence gage is used to measure the angle between two parallel lines.
   收敛器用于测量两条平行线之间的夹角。
2. 2.The convergence gage was used to calculate the distance between two points on a map.
   收敛器被用来计算地图上两点之间的距离。
3. 3.The convergence gage was used to measure the accuracy of the data collected by the surveyor.
   收敛器被用来测量调查员收集的数据的准确性。