建模是进行材料模拟的第一步，这里对LAMMPS常用的建模方法进行总结（我平时用到的，难免不全面）。 概况来说，建模方法有两种：内部建模和外部建模。(Modeling is the first step in the process of material simulation. This is a summary of the modeling methods commonly used in the LAMMPS. In general, there are two types of modeling approaches: internal modeling and external modeling.)