The core of the listing is the defnode macro that takes a node type and a vector of field names, and creates a constructor function for creating maps of that type.
这个清单的核心是defnode宏，它获取一个节点类型和一个字段名矢量，并创建一个构造函数来创建该类型的映射。
The network structure impacts on knowledge flows from node dimensions in the micro-level and overall dimensions in the macro-level.
网络结构从微观层面的节点维度和宏观层面的整体维度两个层次上影响知识流动。
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