relative freedom短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 相对自由 To describe the structures' behavior and connect laminate with3D brick elements better, a kind of32 nodes and 3 layers shell element with relative freedom is presented based on the 3D FEM. 这种32节点壳元可以更好地反映结构固有的特性,易与三维实体单元相连接,使变厚度、带有补强的蜂窝夹芯复合材料壳体等复杂结构问题得以正确建模。 cnki