以下为句子列表：
英文: In my first lecture on the economics of fertilization, I examined the concept of diminishing marginal returns and how this is related to the shape of the production function.
中文: 在肥料经济学的第一讲中，我阐述了边际报酬递减的概念及其与生产函数形状之间的关系。
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英文: More specifically, I showed that diminishing marginal returns is equivalent to a marginal physical product (MPP) that declines with increases in the level of fertilizer that is used.
中文: 具体地说，我说明了边际报酬递减就是边际产量随着肥料用量的增加而递减。
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