[电] intercarrier sound receiving sy-stem

hù zài yīn xiàng jiē shōu xì tǒng ㄏㄨˋ ㄗㄞˋ ㄧㄣ ㄒㄧㄤˋ ㄐㄧㄝ ㄕㄡ ㄒㄧˋ ㄊㄨㄥˇ