基本解释[數學]凸閉包英汉例句雙語例句The paper is concerned with two aspects:A necessary and sufficient condition for convex hull of a set in E2 being closed;本論文以凸躰爲研究對象，主要涉及兩個方麪的內容：平麪凸集的凸包爲閉集的充分必要條件；convex closed hull更多例句词组短语短語closed convex hull [數]閉凸包closed convex cones hull 閉凸錐包convex closed hull更多词组专业释义數學凸閉包