Aiming at the deficiency of existing Doppler effect demonstration instrument, the wiggling-type ultrasonic Doppler effect experiment instrument is designed.是什么意思_Aiming at the deficiency of existing Doppler effect demonstration instrument, the wiggling-type ultrasonic Doppler effect experiment instrument is designed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句