Based on the normal mode analysis, the characteristic equations were deduced from the perturbation equations of fluid mechanics.

基于模态分析，从流体力学扰动方程组出发，推导出了特征方程。

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Part III: From the result of the investigation of Geography Education Practice Mode in Sichuan Normal University, point out analysis of the existing problems.

第三部分：四川师范大学地理教育实习模式开展现状调研结果分析，指出当前存在的一些问题。

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According to social network analysis theory, a large number of abnormal behaviors are always hidden in the normal mode of behavior.

根据社会网络分析理论，异常行为总是隐藏在大量的正常行为模式中。

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