人类步入２１世纪，知识、技能的更新突飞猛进，整个世界都面临着一场重大变革。以计算机和网络技术为代表的信息技术已逐步渗透到各个领域，社会的信息化已是大势所趋。人类需要学习的知识越来越多，这样一来，就给我们掌握这些信息带来了更大的困难。面对这纷繁复杂的计算机 Humanity entered the 21st century, and the renewal of knowledge and skills advanced by leaps and bounds. The entire world was faced with a major transformation. Information technology represented by computer and network technology has gradually penetrated into various fields, and the informatization of society has become a general trend. The more knowledge that humans need to learn, the more difficult it is for us to grasp this information. Face this complicated computer