持续查询使得客户端应用能注册对移动存储在缓存服务器集群上的数据的查询。
Continuous querying enables client applications to register queries to express complex interest on moving data stored in the cache server cluster.
需要一个对移动存储设备进行综合管理的平台，因此必须解决可移动存储设备的识别问题。
A general management software is needed, and the problem of identifying the removable storage device must be solved.
对当前技术的保守推断表明，每个书本大小的可移动硬盘(或者等价的非易失性内存芯片)能存储大约60兆字节。
Conservative extrapolation of current technology suggests that match-book size removable hard disks (or the equivalent nonvolatile memory chips) will store about 60 megabytes each.
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