表现用户接口面板以及它们之间转换的各个状态，反映了和用户在面板上的活动相对应的定位路径。
States represent panels of the UI and the transitions between them represent navigational paths in response to User actions on the panels.
表现用户接口面板以及它们之间转换的各个状态，反映了和用户在面板上的活动相对应的定位路径。
States represent panels of the UI and the transitions between them represent navigational paths in response to User actions on the panels.
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