As the converter of resources, industry structure transforms kinds of factors input into goods and services to meet the social needs.
产业结构作为资源的转换器，是把各种投入要素转化为产品和劳务以满足社会需求。
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This backpack is usually relatively simple structure, no plug-ins or plug-in for less, with the exception of a main bag, usually a 3-5 attached bag for carrying goods classification.
In terms of demand structure, moulds have been widely applied in many industries such as auto, home appliance, instrument, petrochemical, and light industrial goods.