计算机系统的层次结构。内核是硬件系统，是进行信息处理的实际物理装置。最外层是使用计算机的人，即用户。人与硬件系统之间的接口界面是软件系统，它大致可分为系统软件、支援软件和应用软件三层。(Hierarchical structure of computer system. The kernel is a hardware system and a physical device for information processing. The outermost layer is the person who uses the computer, that is, the user. The interface between human and hardware system is software system, which can be roughly divided into three layers: system software, support software and application software.)