也许我会加入“误差因素”，和 delta 一起来确定是等腰三角形还是等边三角形。
Perhaps I will want to add a "fuzz factor" with deltas for determining whether I have an isosceles or equilateral triangle, respectively.
摘要：提出从整体上考虑三角网格模型的简化误差的方法。
Absrtact: Propose a method to evaluate the overall simplification error of triangular meshes.
由此总结出在云南高原地区进行红外仪三角高程代替三、四水准，所产生误差的规律性，并制定一套较实用的操作规程。
The regularity of error and practical instructions are summarized for using infrared range-measurement system instead of the third of fourth grade levelling on Yunnan Plateau.
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