We can use this system to analyze the status of different material surplus and deficiency , control the dynamic material reserve in reason , avoid the material's overstock or the material's scarcity .

分析不同类别物料余缺状态，合理控制动态的物资储备，以避免物资积压及缺料。

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For most of the species's existence, humans lived in small foraging bands that had little material surplus and therefore enjoyed a relatively egalitarian existence.

ECONOMIST: Your parents were right. Patience is a virtue