经过归纳，总结，找到一些规律：即选择适当路径以确定二元函数极限不存在。
After summing up, summarizing, find some laws: Choosing proper route to confirm the function limit of two variables' doesn't exist.
最后，经过分析归纳出本课题研究中存在的问题和下一步的努力方向。
End, through analysis summary origin topic research medium existence of problem and next move of effort direction.
经过对实例分析过程及结果的拓展，归纳出高校教师教学水平评价的问题可能原因分析表，原因剖析示意图与绩效分析流程图。
It concludes the analysis table of reasons of the teaching level evaluation of college teacher, the sketch map of reason anatomy and flow chart of performance analysis.
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