短語詞組短語telephone conference system tcs 電話會議系統(tǒng)Telephone conference bridge system 發(fā)明名稱telephone conference tandem system 電話會議匯接系統(tǒng)conference telephone system 會議電話系統(tǒng);會議電話conference telephone switch system 會議電話匯接機(jī)conference e telephone switch system 會議telephone conference of semi -distribution system 半分配制會議電話 返回 telephone conference system