The indifference curve may be compared with a contour line on a map. 無(wú)差別曲線(xiàn)可以與地圖上的等高線(xiàn)相比擬。
Assuming a horizontal block of ups and downs on the ground, the water's surface and materials County line is a continuous contour. 假設用一個(gè)水平面街區高低起伏的地面，則水品縣與地面的交線(xiàn)就是一條連續不斷的等高線(xiàn)。
The vertical line meets the horizontal one here. 垂直線(xiàn)與水平線(xiàn)在此相交。
Fill the generator with fresh water above the normal water level. 給發(fā)生器注入正常水平線(xiàn)以上的清水。
