Presently,some traditional theories including Urban Geography,Central Place Theory,Urban Society Science,cannot give a substantial answer to the optimization problems of urban land multiple-structure. The cause is that optimizing the structure has some characters of un-order,diversification,differentiation,random, un-organization and artificial factors.
优化的不均匀性、多样性、差异性、随机性、无序性和高度人工化,使得城市地理学、中心地理学、城市社会学已经很难解决实质的城市土地多中心结构优化问题。
参考来源 - 城市土地多中心结构优化模型理论探索·2,447,543篇论文数据，部分数据来源于NoteExpress
A shape might have properties for location, color, etc., and may be a group structure of multiple shapes.
一个形状可能具有位置、颜色等特性，并且可能是多个形状构成的一组结构。
This can be more practical if the same basic structure is used in multiple places within your application.
如果同一个基础结构用在应用程序内的多个地方，这一点更具实用性。
This also provides more clarity, because you have avoided the multiple indirections of union or structure variables.
这还可以让程序代码更加清晰，因为这样就避免了使用多个间接联合或结构变量的情况。
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