The indifference curve may be compared with a contour line on a map. 无差别曲线可以与地图上的等高线相比拟。
Assuming a horizontal block of ups and downs on the ground, the water's surface and materials County line is a continuous contour. 假设用一个水平面街区高低起伏的地面,则水品县与地面的交线就是一条连续不断的等高线。
The vertical line meets the horizontal one here. 垂直线与水平线在此相交。
Fill the generator with fresh water above the normal water level. 给发生器注入正常水平线以上的清水。