当其增大到一定程度时，其影响可忽略，即半透水边界可作为完全透水边界来处理。
When it increases to a certain degree, the influence could be neglect, i. e. the semi-permeable boundary could be treated as complete permeable boundary.
当其增大到一定程度时，其影响可忽略，即半透水边界可作为完全透水边界来处理。
When it increases to a certain degree, the influence could be neglect, i. e. the semi-permeable boundary could be treated as complete permeable boundary.
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