其原理主要是对一组词两两统计它们在同一篇文献中出现的次数，对这些词进行聚类分析，进而分析这些词所代表的学科和主题的结构变化。
Its main principle is to make statistics of pairs of words appearing in the same documents and then analyze structural changes of disciples and subjects they represent.
讨论了三种常见的CMOS集成电路电源总线esd保护结构，分析了其电路结构、工作原理和存在的问题，进而提出了一种改进的ESD保护电源总线拓扑结构。
Three common power bus ESD protection structures in CMOS IC were discussed, the circuit structure and working theories were analyzed, an improved power bus ESD protection structure was put forward.
激光器中激光介质采用板条状几何结构可以极大地降低它的热效应，但仍然需要进一步分析其影响，进而优化激光器效率。
The use of slab geometric structure in laser can greatly reduce thermal effects of laser medium, but further analysis of its impact is necessary for optimizing the efficiency of lasers.
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