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。

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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。

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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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