The indifference curve may be compared with a contour line on a map. 無差別曲線可以與地圖上的等高線相比擬。
Are strips of a mouth thickness and back thickness basic indifference, to guarantee the binding of skinpass intervetebral collers. 均能做到裁口厚度和書背厚度基本無差別，保證了膠訂書刊外型的平整美觀。
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