The urban economic system is a cyclic matter system consisting of environment, resource, production and consumption.
城市经济系统是一个由“环境—资源—生产—消费—环境”组成的物质循环系统。
The urban economic system is a cyclic matter system consisting of environment, resource, production and consumption.
城市经济系统是一个由“环境—资源—生产—消费—环境”组成的物质循环系统。
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