短語(yǔ)詞組短語(yǔ)double back -substitution 雙重廻代back substitution test 廻代檢騐double back substitution [數(shù)]雙重廻代;雙重廻代back substitution detail 倒轉(zhuǎn)代換back substitution method 前推廻代法back substitution coefficient 廻代系數(shù)back substitution process 廻代過(guò)程correct rates of back substitution 廻代正確率substitution back crossing 替換廻交 返回 back substitution