反射衰減率，回波衰減率 echo attenuation: 反射衰減; 回波衰減; 回聲衰減attenuation ratio: 衰減比例; 衰減率ratio of attenuation: 衰減比echo attenuation measuring set: 回波衰減測量儀echo ratio: 回波比下載手機(jī)詞典可隨時隨地查詞查翻譯
