求翻译：The focus of lean logistics can be traced to relatively recent developments of total costing theory and practice. In 1956, a classic monograph describing airfreight economics provided a new perspective concerning logistical cost.' In an effort to explain conditions under which high-cost air transport could be justified, Lewis, Culliton, and Steele conceptualized the total cost logistics model. Total cost was positioned to include all expenditures necessary to perform logistical requirements. The authors illustrated an electronic parts distribution strategy wherein the high variable cost of direct factory-to-customer air transport was more than offset by reductions in traditional inventory and field warehouse costs. They concluded that the least total cost logistical way to provide the desired customer service was to centralize inventory in one warehouse and make deliveries using air transportation.是什么意思？

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