In this paper, we expound the reqularity of change in price when the supplies and de-mand of commodity change in the mathematical model of difference equation.是什么意思_In this paper, we expound the reqularity of change in price when the supplies and de-mand of commodity change in the mathematical model of difference equation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句