The objective function on line 20 minimizes the total food cost as the total of each decision variable (amount of food) multiplied by that food's cost per unit.
第20行的目标函数要对食物的总体成本实现最小化，该值是每个决策变量(食物数量)乘以每单位食物成本的结果。
Unit production cost is a function of production rate.
单位生产成本是生产率的函数。
The function relation about unit cost of circulating logistics has perfectly explained one salience of physical distribution—gathering effects.
这种单位流通业物流成本函数关系很好解释了物流配送的一个显著特点—集聚效应。
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