Without this extra information, it would need to retransmit much more data and slow down its sending rate to accommodate what looks like a high-loss network.
如果没有这种附加信息，它需要重新传送大量的数据，这样会降低传送速率，从而适应高丢包率的网络。
It improves the data transport rate and decreases the possibility of network congestion.
组播传输提高了数据传送效率，减少了网络出现拥塞的可能性。
A key of multimedia communication is the video communication due to the contradictory between the enormous data of video information transmitted and low transmitted rate in channel of network.
大数据量的视频信息传输与网络信道低传输速率的矛盾，使得视频通信成为多媒体通信的关键。
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