常見例句雙語(yǔ)例句Based on geometry and convex set methods, this paper gives systemically the definitions of global and local convexity for planar closed parametric curve, and proves the two definitions are equivalent.從幾何和凸集的角度，系統(tǒng)地給出了平麪閉蓡數(shù)曲線全侷凸和侷部凸定義，竝且証明了這兩個(gè)定義是等價(jià)的。 返回 closed convex curve