“principal radii of normal curvature”的概念、定义、翻译、参考文献-科学参考

单词	principal radii of normal curvature
释义	principal radii of normal curvature [¦prin·sǝ·pǝl ¦rād·ē´ī ǝv ¦nȯr·mǝl `kǝr·vǝ·chǝr] ^MATHEMATICS The reciprocals of the principal curvatures of a surface at a point.
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