The sequence starts when a user requests a command (an application function) to be executed by interacting with a user interface object, in this case the main form of the application.
当用户请求命令（应用功能）时，序列通过与用户接口对象相互作用来被执行。
For example, hearing that the application is slow whenever someone works with a document of form Main may lead you to conclude that something about the code in that form needs work.
例如，如果听说只要某人处理Main表单的文档，应用程序就会慢下来，这可能让您得到下面的结论：需要处理关于该表单的代码的某些东西。
The bottom panel of the main GUI consists of buttons for adding or modifying employee records, for clearing the form fields of a panel, and for exiting the application.
主gui的下面那个面板中包括一些用来添加或修改员工记录、清空面板中的字段以及退出程序的按钮。
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