Traditional Huffman coding is structured in the way of tree pattern, using the chain or static chain structure in algorithm, and every node in space has left, right tree and parents Pointers.
传统哈夫曼编码借助树形结构构造，算法实现时使用链表或静态链表结构，空间的每个结点内有左、右子树、双亲指针。
It also proposes the pattern of tree-network structure of urban green space based on the advantage and flaw of tree-type structure and network-type structure.
结合树型结构和网络结构的自身优势与缺陷，提出了城市绿地树网型结构模式，并对城市绿地树网结构的特征、优势和研究方向提出了建议。
Land use structure refers to all types of land use within the region in the contrast of number, relationship in space and in the pattern of formation and ownership.
土地利用结构是指区域内各类土地利用之间在数量上的对比关系和空间上的相互位置关系形成的格局，以及权属上的所属关系的总和。
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