In the finite element method, one of the restrictions on the approximating functions is relaxed. 在有限单元方法中，放开了定近似函数的限制。
It is difficult to settle essential boundary conditions in meshless method because the meshless approximation functions are not built by interpolation schemes. 摘要无网格法中的近似函数大都不是插值函数，在处理本质边界条件时较为困难。
