求翻译：Economy of distance refers to decreased transportation cost per unit of weight as distance increases. For example, a shipment of 800miles will cost less to perform than two shipments of the same weight each moving 400 miles. Transportation economy of distance is often referred to as the tapering principle. The rationale for distance economies is similar to economies of scale. Specifically, longer distances allow fixed cost to be spread over more miles, resulting in lower per mile charges. These scaling principles are important when evaluating transportation alternatives. The goal from a transportation perspective is to maximize the size of the load and the distance being shipped while still meeting customer service expectations.是什么意思？

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