说明： 软件：计算机系统中的程序及其文档
系统软件：居于计算机系统中最靠近硬件的一层，其他软件一般都通过系统软件发挥作用。他和具体的应用领域无关，如编译系统和操作系统等。
(software : computer systems and procedures documentation system software : living in computer systems layer closest to the hardware, other software systems through software play a role. He and specific applications related to the field, such as the build system and OS.)
