边际值为因变量变化量与自变量变化量的比值这句话怎样用英文翻译啊

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中文都看着晕.
======以下答案可供参考======
供参考答案1:
marginal value 边际值
variance变化量
independent variable 自变量
dependent variable 因变量
比值 ratio ;specific value
marginal value is the ratio between independent variable and dependent variable.
供参考答案2:
晕啊The marginal value is the ratio of the variance of the dependent variable and the variance of the independent variable