应用软件坐在系统软件的上面，这是因为如果没有操作系统和系统公用程序应用软件将不能运行。
Application software sits on top of system software because it is unable to run without the operating system and system utilities.
应用软件坐在系统软件的上面，这是因为如果没有操作系统和系统公用程序应用软件将不能运行。
Application software sits on top of system software because it is unable to run without the operating system and system utilities.
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