计算机系统，应该是每一个软件开发者的必读书。虽然现在编程语言已经离计算机系统越来越远，但是编程的核心技能还是紧贴着计算机系统。比如java这种面向对象的语言，虽然运行在虚拟机上，但时时刻刻都和计算机系统打着交道，所以不可不知的知识。(A computer system should be a must read for every software developer. Although programming languages are now far removed from computer systems, the core skills of programming are still clinging to computer systems. For example, Java, an object-oriented language that runs on a virtual machine but is always dealing with the computer system, is a must.)