[电] frequency-modulated carrier-curr-ent telephony

tiáo pín zài bō diàn liú diàn huà ㄊㄧㄠˊ ㄆㄧㄣˊ ㄗㄞˋ ㄅㄛ ㄉㄧㄢˋ ㄌㄧㄡˊ ㄉㄧㄢˋ ㄏㄨㄚˋ