The research work of this thesis intends to study the DFR theory and test method with its application in the running frame of low-speed magnet driven aerotrain.是什么意思_The research work of this thesis intends to study the DFR theory and test method with its application in the running frame of low-speed magnet driven aerotrain.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句