短語(yǔ)詞組短語(yǔ)double back -substitution 雙重回代back substitution test 回代檢驗(yàn)double back substitution [數(shù)]雙重回代;雙重回代back substitution detail 倒轉(zhuǎn)代換back substitution method 前推回代法back substitution coefficient 回代系數(shù)back substitution process 回代過程correct rates of back substitution 回代正確率substitution back crossing 替換回交 返回 back substitution