这些数据集内的知识库都可以被访问，并和其它数据集的内容连接在一起。
The data sets all grant access to their knowledge bases and link to items of other data sets.
扩展提供了一种便利方法，该方法可以解决这个问题和其它几种当您在非平凡数据集上使用xsl时可能遇到的难题。
Extensions provide a convenient way around this and several other possible hang-ups that you may encounter when using XSL on nontrivial data sets.
这些数据集无疑将为研究人员提供从其它渠道难以获取的信息。
These datasets will undoubtedly provide the researchers access to information that would otherwise be very difficult or expensive to obtain.
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