为了满足新的需求，设计也在不断演化，关键对象承担着各种模式角色，直到它们变得难以使用或者难以修改，最终不得不重构或者重写系统。
As the design evolves to meet new needs, key objects are loaded with pattern roles until they become hard to use or hard to change and the system has to be refactored or rewritten.
文中以系统论的观点总结了台地相与槽盆相的差别及各相之间的关系，建立了二叠纪至早三叠世平果台地沉积体系之演化模式。
According to the viewpoint of system theory, the difference between platform facies and trough facies, and the influnece among them are summarized, and their evolution model is found in this paper.
文中概述了青藏高原基本构造格局、青藏高原多岛弧盆系统洋陆转换演化模式。
This paper has dealt briefly with the basic structural framework, and the marine-land transfer and evolutional model of the archipelago arc-basin system of the Qinghai-Tibet plateau.
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