基本解释[数学]凸闭包英汉例句双语例句The paper is concerned with two aspects:A necessary and sufficient condition for convex hull of a set in E2 being closed;本论文以凸体为研究对象，主要涉及两个方面的内容：平面凸集的凸包为闭集的充分必要条件；convex closed hull更多例句词组短语短语closed convex hull [数]闭凸包closed convex cones hull 闭凸锥包convex closed hull更多词组专业释义数学凸闭包