求翻译：（2） 算例7-11表明，当系统库存费用相对运输成本较低时，应该采取延长计划期以减少进货次数、降低运输成本来实现系统总成本节约；是什么意思？

(2) examples 7-11 show that when the system inventory costs are relatively low transportation costs should be taken to extend the planning period in order to reduce the number of purchase, reducing transportation costs to achieve total system cost savings;

(2) * examples 7-11, when the system shows that inventory costs low relative costs should be taken when you plan to extend that period to reduce incoming number, lower transportation costs to achieve total system cost savings.

(2) The example 7-11 indicated, when the system stock expense relative transportation cost is low, should adopt the extension plan time to reduce the inventory number of times, to reduce the transportation cost to realize the system total cost to save;

(2) example 7-11 indicates that, when the system at lower inventory costs, transport costs, should be taken to extend the scheme to reduce purchase frequency, lower transport costs to achieve total system cost savings;

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