contour line

(geography) A line on a map through points of equal elevation, often height above sea level.

日本語の意味

等高線：地図上で、同じ標高（海面上の高さなど）を持つ地点を結んだ線

The hiker carefully followed the contour line on the map to avoid steep slopes.

その登山者は急な斜面を避けるために地図の等高線に注意深く沿って進んだ。

意味（1）

(geography) A line on a map through points of equal elevation, often height above sea level.

contour lines

（ plural ）