The following proposition are proved:Let P_0 be a point on the contour of a smooth surface withnegative gaussian curvature S,the asymptotic direction of P_0 on S is the critical direction for the visi-ble contour of S in the neighborhood of P_0.是什么意思_The following proposition are proved:Let P_0 be a point on the contour of a smooth surface withnegative gaussian curvature S,the asymptotic direction of P_0 on S is the critical direction for the visi-ble contour of S in the neighborhood of P_0.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句