常見例句雙語例句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)地給出了平面閉參數(shù)曲線全局凸和局部凸定義，并且證明了這兩個(gè)定義是等價(jià)的。 返回 closed convex curve