短語詞組短語ifs iterate function system 迭代函數(shù)系統(tǒng)Iterate Function System 迭代函數(shù)系統(tǒng);將迭代函數(shù)系統(tǒng)iterate function system ifs 分形迭代函數(shù)系統(tǒng)system of function iterate 函數(shù)迭代系統(tǒng) 返回 iterate function