无差异曲线通常呈凸形.An indifference curve is usually assumed to be convex.我们现在开始接触到值得引起注意的无差异曲线.We come now to the really remarkable thing about indifference curves.而既往吸烟者同不吸烟者之间无差异.Similar calculations erased the sick - day gap ...

“无差异”的英语可以翻译为：zero difference ...