社会无差异曲线的英文：
social indifference curve
adj. 社会的；群居的；合群的；社交的
n. 联谊会；社会聚会
A social debut.
首次进入社交界，首次演出
Slavery was once socially sanctioned.
奴隶制曾经为社会所认可。
social service facility
社会服务场所
n. 漠不关心，冷淡；中立
Her English is indifferent.
她的英文很一般。
He made an affectation of indifference.
她为人诚恳，毫不矫揉造作。
The opposite of love is not hate, but indifference and unconcern.
爱的反面不是仇恨，而是漠视且不关心。
n. 曲线，弧线，曲面，弯曲；曲线球
v.（使）沿曲线运动
Joining Convex (Outer) Curves to Concave (Inner) Curves
缝合凸出的弯曲部位和凹曲部位
The road curved sharply to the right.
道路有个急转弯拐向右边。
To bend or curve downward;stoop.
弯向下弯曲；俯曲