resource busy indicator [计] 资源忙闲指示器
outgoing line busy indicator 出线忙指示器
busy lamp indicator 工作中指示器
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Image VP——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“is busy”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。
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