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1. Oxford Dictionary

   contour line

   • n.
     a line on a map joining points of equal height above or below sea level

   • noun: contour line, plural noun: contour lines

2. • 釋義

   n.

   名詞

   • 1. a line on a map joining points of equal height above or below sea level every valley bottom below a certain contour line must have been soggy and at times impassable