单词：indifference curve
indifference curve的用法和样例：
例句
- An indifference curve is usually assumed to be convex.无差异曲线通常呈凸形。
- We come now to the really remarkable thing about indifference curves.我们现在开始接触到值得引起注意的无差异曲线。
- 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。
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