环形壳
- 网络Annular shell;gyrocone
环形壳-
杂色小纹贝，所谓珍珠母的两片介壳差不多相等，壳作圆环形，壳壁很厚，外表很粗，凹凸不平。
The shellfish Meleagrina , that womb for pearls whose valves are nearly equal in size , has the shape of a round shell with thick walls and a very rough exterior .
-
首次建立了曲梁单元、截圆锥壳单元、环形浅球壳单元、压电线球壳单元等微分求积单元。
Several Differential Quadrature elements are established for the first time , such as the circular arch element , conical shell element , shallow spherical shell element , and piezo-electrical shallow spherical shell element .