有两种类型的对话框，即模态对话框和非模态对话框。
There are two types of dialog boxes: modal and modeless. Modal dialogs boxes are, by far, the most common variety.
模态对话框冻结了应用程序的状态，因此避免了这些问题，所以非模态对话框的设计和实现比模态对话框要难得多。
Consequently, modeless dialogs can be much more challenging to design and implement than modal dialogs, which avoid these issues by freezing application state.
模态对话框和非模态对话框的概念来源于程序员的术语，它们影响了我们的设计，但我们也必须从目标导向的观点来考查对话框。
The concepts of modal and modeless dialogs are derived from programmers' terms. They affect our design, but we must also examine dialogs from a goal-directed point of view.
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