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.
相对于绝大多数物种的存在方式而言，人类生活在一个很小的狭长地带，那里几乎没有剩余食物，因此可以以相对平等的方式生存。
Most metal and plastic parts are designed to be manufactured, which means they can be clunky and contain material surplus to the part's function but necessary for making it.
大多数金属和塑料是为了生产而设计的，这就意味着它们会很重，并且含有与生产有关，但与其功能无关的剩余物。
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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