The theorem of the variational problems of the complete functional is proposed and proved.The complete Euler equation set is obtained through the introduction of the partial differential operator.是什么意思_The theorem of the variational problems of the complete functional is proposed and proved.The complete Euler equation set is obtained through the introduction of the partial differential operator.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句