The influence of the injected gas volume on the output performanc e of positive displacement motor (PDM) is obvious in the process of aerated UBD.是什么意思_The influence of the injected gas volume on the output performanc e of positive displacement motor (PDM) is obvious in the process of aerated UBD.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句