短語詞組短語sound wave signal 聲波信號sound emergency signal 音響緊急信號sound frequency signal 音頻信號sound light signal 聲光信號surround sound audio signal 環(huán)繞聲音頻信號sound crossing signal 平交道音響報知機multimedia sound source signal 多媒體音源信號sound energy signal 聲音能量信號sound signal shell 音響榴彈;聲響榴彈 返回 sound signal