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。
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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