[经] fluctuations in prices of raw materials and supplies

yuán cái liào hé wù liào de jià gé biàn dòng ㄩㄢˊ ㄘㄞˊ ㄌㄧㄠˋ ㄏㄜˊ ㄨˋ ㄌㄧㄠˋ ㄉㄜ˙ ㄐㄧㄚˋ ㄍㄜˊ ㄅㄧㄢˋ ㄉㄨㄥˋ