在超曲面几何学中，对主曲率的研究是至关重要的。

It is essential to study the principal curvature of hypersurface in the hypersurface geometry.

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利用几何学知识推导出了确定电力系统实用动态安全域（PDSR）临界超平面的截距法。

An intercept method to determine critical hyper-planes of practical dynamic security region (PDSR) of power system is developed by use of knowledge of geometry.

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