处理六面体，四面体，四边形和三角网格。拉格朗日，层次，以及单项有限元。接口PETSc解，自适应网格加密，和极端portablility 。 -Handles Hexahedral, Tetrahedral, Quadrilateral, and Triangle meshes. Lagrangian, Hierarchic, and Monomial finite elements. Interface to PETSc solvers, adaptive mesh refinement, an