絣有许多类型的软件系统，但是对于今天，每种计算机系统以两种系统软统软件为中心：操作系统和编译器。
There are many types of systems software, but two types of systems software are central to every computer system today: an operating system and a complier.
絣有许多类型的软件系统，但是对于今天，每种计算机系统以两种系统软统软件为中心：操作系统和编译器。
There are many types of systems software, but two types of systems software are central to every computer system today: an operating system and a complier.
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