The users either use two different devices (4, 5) or use one device (6) for exchanging audio and for receiving video.
用户使用两个不同设备（4，5）或者一个设备（6）交换音频和接收视频。
The users either use two different devices (4, 5) or use one device (6) for exchanging audio and for receiving video.
用户使用两个不同设备（4，5）或者一个设备（6）交换音频和接收视频。
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