短語詞組短語ultrasonic scattering echo method 超聲散射回波法ultrasonic pulse echo technique 超聲脈沖反射技術(shù)ultrasonic pulse echo signal 超聲脈沖回波信號(hào)ultrasonic flaw echo 超聲缺陷回波ultrasonic c echo sounder 超聲回波測(cè)深儀ultrasonic bottom echo 超聲底面回波ultrasonic multiple echo reflection method 超聲多次回波反射法 返回 ultrasonic echo