说明：  COMSOL原为FEMLAB，一个MATLAB下的工具箱，后期独立为完整的有限元仿真程序，本文为英文原版，亚马逊官网可查，售价不费。
(COMSOL was originally FEMLAB, a MATLAB toolbox, the latter part of the independent finite element simulation program, this article is the original English, Amazon official website can be checked, the price is not cost.)