However, the media transport mechanisms of most existing products are based on central-server mode, which sets a severe limitation on the system's stability and scalability.

然而，现有的视频会议产品在媒体传输模式方面多采用基于中央服务器的转发方式，对于系统的稳定性及扩展性都存在着严重的制约。

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While there is no legal limitation on a government during an election period the legal consideration is not the central consi deration.

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