With RRAFS, we can also create two Image VPs — one for the busy indicator and another with an empty content — as shown in Figures 19 and 20, respectively.
用RRAFS，还可以生成两个ImageVP——一个用于占线指示器，另一个为空——如图19和图20分别所示。
The viewmodel exposes not only models, but other properties (such as state information, like the "is busy" indicator) and commands
视图模型不仅暴露模型，还有属性（比如状态信息，就像“isbusy”指示符）和命令。
Instead, build a status indicator into the application so the problem is clear to the interested user but is not obtrusive to someone who is busy elsewhere.
试着在程序中建立一个状态指示器，这样遇到问题时对有兴趣知道的用户就会很清楚，而不用打扰那些正忙于其他任务的用户。
Instead, build a status indicator into the application so the problem is clear to the interested user but is not obtrusive to someone who is busy elsewhere.
试着在程序中建立一个状态指示器，这样遇到问题时对有兴趣知道的用户就会很清楚，而不用打扰那些正忙于其他任务的用户。
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