[电] bandspread tuning comtrol, bandspread tuning control
bō dài kuò zhǎn tiáo xié kòng zhì ㄅㄛ ㄉㄞˋ ㄎㄨㄛˋ ㄓㄢˇ ㄊㄧㄠˊ ㄒㄧㄝˊ ㄎㄨㄥˋ ㄓˋ