In this paper, we propose an improved Click-Stream Tree model characterized by incorporating conceptual hierarchy of the web site.

文中提出了一种改进的点击流树模型，其主要特点是融入了站点的概念层次。

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Bad programmers write code which lacks conceptual integrity, non-redundancy, hierarchy, and patterns, and so is very difficult to refactor.

而烂程序员写出来的代码连基本的概念完整性都达不到，更何况没有冗余，拥有明晰的层次结构了，所以这样的代码很难去重构。

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A hierarchy conceptual model of the armor protection of engineer equipment was constructed and the method of analyzing and calculating its cost and effectiveness was proposed.

构建了工程装备战场防护的层次概念模型，提出了一种装备战场防护费用和防护效果的分析计算方法。

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The selection seems at once profligate and restrictive, the unfamiliar pieces, many of them deservedly obscure, failing to alter the hierarchy other curators have established of leading Conceptual artists, and the absence of video omitting the sharpest new tool artists in the 1960s and '70s used to upset standards of camera-made perception.

WSJ: Light Years: Conceptual Art and the Photograph, 1964-1977 | Snapshot of a Movement | By Richard B. Woodward