Group: a group of users with similar mobile data synchronization needs.
组：有相似移动数据同步需求的一组用户。
Until now, there is no practical optical buffer. In our case, we try to realize data storage or packet synchronization by slowing down the group velocity of light.
目前还没有可实用的光缓存，我们旨在通过减慢光速来实现信号的存储或者同步。
Until now, there is no practical optical buffer. In our case, we try to realize data storage or packet synchronization by slowing down the group velocity of light.
目前还没有可实用的光缓存，我们旨在通过减慢光速来实现信号的存储或者同步。
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