字典網>> 英漢字典>> S開頭詞條>>second-trip echo的意思 漢英字典second-trip echo中文翻譯：【電】 第二次反射回波字典網相關詞條：secondary sex characteristic second-order asymmetric transformation secondary urethra secondary degeneration secondary extinctive reflex second category axis second value axis secondary anemia secondary rule secondary hypothyroidism