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1. The marginal rate of substitution betweenoil and gas is a key factor indetermining the optimal mix of energy sources.
石油和天然气之间的边际替代率是决定最优能源组合的关键因素。
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2. In economics, the marginal rateof substitution refers to the changein the quantity of one good usedfor a given amount of another good.
在经济学中，边际替代率指的是用一定量的另一种商品替换一种商品时，该商品数量的变化。
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3. The marginalrate of substitution can beinfluenced by factors such as price, availability, and consumer preferences.
边际替代率受到价格、可获得性和消费者偏好等因素的影响。