用例是由参与者与应用程序交互为实现某个指定目标而执行的单个任务。
A use case is a single task performed by an actor interacting with your application toward a specified goal.
DB 2安装程序读取这个文件，并根据已经指定的值执行安装。
The file is read by the DB2 setup program and the installation is performed according to the values that have been specified.
After running设置指定在安装程序完成后执行的动作。
The after running setting specifies the action to be performed after the installation program completes.
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