[经] inconvertibility of paper currency

zhǐ bì de bù kě duì huàn xìng ㄓˇ ㄅㄧˋ ㄉㄜ˙ ㄅㄨˋ ㄎㄜˇ ㄉㄨㄟˋ ㄏㄨㄢˋ ㄒㄧㄥˋ