1. The map shows several contour lines to indicate the mountain's shape.
这张地图显示了几条等高线以指示山体的形状。
2. When the contour lines are very close together, it means the slope is steep.
当等高线非常密集时，意味着坡度很陡。
3. We followed the contour line to maintain a steady elevation while hiking.
我们沿着等高线行进，以便在徒步时保持稳定的海拔高度。

A: Can you read this topographic map?
A：你能看懂这张地形图吗？

B: Yes, the contour lines make it easy to see the steep cliffs.
B：能，这些等高线让看清那些陡峭的悬崖变得很容易。

1) 地图上连接等高点的线

2) 描述物体轮廓的线

1. 等高线

e.g.
The contour line shows the elevation of the ground.
等高线显示了地面高度。

noun phrase

1. A line on a map joining points having the same altitude, especially on a map marking the shape of the land.