就像许多VMware或Citrix Xen用户的体验一样，个体用户也很难跟踪虚拟机。

As many users of VMware or Citrix Xen are aware, even for an individual user, it can be difficult to keep track of virtual machines.

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根据尼尔森9月份报告，《赫芬顿邮报》拥有947万个体用户，相比之下，BBC个体用户为720万。

According to the Nielsen's September report, the Huffington Post is at 9.47 million unique users, compared with theBBC's 7.2 million.

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指出了传统信息查寻和情报检索研究只针对个体用户的行为，忽视查寻的社会情景以及用户之间的相互关系的问题。

Traditional information search and retrieval research focused on single-users' activities with less attention on the social context of information search and interaction among users.

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