面对日益增长的数据库，人们将如何从这些浩瀚的数据中找出有用的知识？我们如何将所学到的知识去粗取精？什么是对事物的粗线条描述什么是细线条描述？-Faced with the ever-growing database, how will people from these vast data to find useful knowledge? We learned how to integrate the knowledge去粗取精? What is a broad-brush descr ipt