Thank you, Aganzir! It was just my luck that those letters revealed a crucial word
"-/ --/ ---/ -/ ----_----/, ---/," (......) "---/ -/ ---/, ---/ -/ -------/ ------/. ---/ -----/ ---/ ---/ --/ --/ ------/ --/ --/ ----/ --/ ----/ --/ -----/."
_ is a hyphen.