essentialsn.要件;概要
essentialadj.本质的;必要的;重要的n.要素;必需品
essential assumption基本假设
essential difference主要区别
essentially negative基本阴性
essential activation基本激活作用
essential congruence本质同余
essential courseware精品课程
essential properties基本性能, 基本性质, 必然属性
Essential principles基本原则
essential attributes本质属性
essential definition实质定义