An important topic of rough set theory is the approximations of undefined concept through defined concept,and its basic work is how to construct the defined concept and approximation operators.是什么意思_An important topic of rough set theory is the approximations of undefined concept through defined concept,and its basic work is how to construct the defined concept and approximation operators.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句