ditrigon

例句：

1. 1.The engineer measured the length of the rope with a ditrigon.
   工程师用分度盘测量了绳子的长度。
2. 2. The car's speedometer is a ditrigon that shows the speed in kilometers per hour.
   汽车的速度表是一个分度盘，显示的是每小时公里数。
3. 3. The clockmaker used a ditrigon to make the clock more accurate.
   钟表匠使用一个分度盘使钟表更加精确。