He surmised that the rotating magnetic field could be created using AC instead of DC, but at the time he did not know how to achieve this feat.是什么意思_He surmised that the rotating magnetic field could be created using AC instead of DC, but at the time he did not know how to achieve this feat.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句