边际替代率递减的英文：
diminishing marginal substitution
v. 减小，削弱，变少，失势，形成锥度
- But gradually his fear diminished.
后来他的惶恐渐渐地减少了。 - He likes to diminish the skills of others.
他喜欢贬低别人的技能。 - As he turned the knob the sound diminished.
他一转旋钮，声音就变小了。
adj. 边缘的；临界的；末端的
- marginal initial
边缘原始细胞[见于植物] - We came to the margin of the wood.
我们来到树林的边缘。 - margin release mechanism
极限释放机构
n. 代替，置换；代替者，代替物
- a substitute; a substitution; a replacement
代替物 - horn substitute
角质物 - He substituted cunning for their simplicity.
他以奸滑代替了他们的直率。