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中文摘要：
Variational principles are constructed using the semi-inverse method for two kinds of extended Korteweg-de Vries (KdV) equations,which can be regarded as simple models of the nonlinear oceanic internal waves and atmospheric long waves,respectively.The obtained variational principles have also been proved to be correct.
英文摘要：
Variational principles are constructed using the semi-inverse method for two kinds of extended Korteweg-de Vries （KdV） equations, which can be regarded as simple models of the nonlinear oceanic internal waves and atmospheric long waves, respectively. The obtained variational principles have also been proved to be correct.
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