the author introduced here
作者在此介绍
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A formula derived by the author for calculation of arbitrary three centered arch type headings was introduced here with some modifications made to the conventional design and calculation methods.
介绍了所推导的任意三心拱巷道计算公式，并修正了拱形巷道传统的设计与计算。
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