telephonyn.
英 təˈlefəni | 美 tə'lɛfəni
中文n. 电话（学）；电话制造
词根词源
telephony (n.)1835, "a system of signaling by musical sounds;" from 1876 as "the art of working a telephone;" see telephone (n.) + -y (4). Related: Telephonist.
关键词