等高线

例句：

1. 1. The map shows the elevation of each point on the mountain.
   这张地图显示了山上每个点的海拔高度。
2. 2. The engineer used a level to check the accuracy of the elevation lines.
   工程师用水准仪检查了等高线的准确度。
3. 3. The construction crew carefully marked the elevation lines during the excavation process.
   施工队在挖掘过程中仔细标记了等高线。