求翻译：本文以汽车制造企业m包括“供应商-制造商-分销商-零售商”的多级供应链所构成的网状多级库存系统为研究对象（如图1所示），针对多产品、多周期、需求随机的情况，引入级库存和供应链链内成本的思想，建立基于成本优化的多级库存控制模型。是什么意思？

This article to the automobile manufacturing enterprise m mesh supplier - manufacturer - distributor - retailer of multi-level supply chain composed of multi-echelon inventory system for the study (Figure 1), for multi-product, multi-cycle, the random demand, the introduction of level inventory and

This article in the car manufacturing companies including M supplier - manufacturer - Distributor - retailer of multi-level supply chain constitutes a mesh multi-level Inventory system as the object of study (as shown in Figure 1, for many products, multi-cycle, demand the random level, to inventory

The lattice multistage inventory system take automobile manufacture enterprise m which this article includes “supplier - manufacturer - distributor - retail merchant” the multistage supply chain constitutes as the object of study (as shown in Figure 1), in view of the multi-products, the multi-cycle

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