The key question is what to ignore and what to show in real-time applications, where user control is not appropriate.
关键的问题是忽略什么内容以及在实时应用中显示什么内容，其中用户控制是不适当的。
In our implementation, the default module is used to forward control to the next appropriate module; page navigation is not required.
在我们的实现中，default模块用于将控制权交给下一个适当的模块；并不需要页面导航。
Note that when the currently active audio output device does not support volume control (such as an A2DP device), the volume slider is replaced by the appropriate device name.
注意如果当前的声音输出设备不支持音量控制(就像设备A2DP)，音量滑块就不会显示，取而代之的是设备名称。
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