N-COUNT
(地图上的)等高线
A contour on a map is a line joining points of equal height and indicating hills, valleys, and the steepness of slopes.
例句
There were three moderate climbs to just below the 450 feet contour.
刚好在450英尺的等高线之下有3个缓坡。
...a contour map showing two hills and this large mountain in the middle.
标示着两座小山和中间这座大山的等高线地图