We get the lattice wave solution of monatomic chain under the free boundary condition.
在不使用循环边界条件情况下，求解出一维原子链的振动解析解。
The lattice wave solution of single atomic chain only results from the cyclic boundary condition.
指出一维单原子链的格波解是由于采用了循环边界条件的结果。
Lattice wave will be reflected when it reaches the boundary so that the reflecting boundary condition is more reasonable than cyclic boundary.
因为晶格振动的波在达到界面时会被反射，所以镜面反射边界条件与循环边界条件相比更符合晶格振动的特点。
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