point of time machine(点读机) point of time document(点读笔) E-reader/electronic paper book(电子阅览器/电纸书) ..
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The document library also provides information about the point in time of its last modification.
文档库也提供关于最后一次修改的时间点的信息。
While any valid OWL document can be used as a Classification system, at this point in time Registry and Repository exploits only a small subset of the expressiveness of OWL.
虽然任何有效的OWL文档都可用作分类系统，但目前Registry and Repository中仅利用了OWL表达能力的一个很小子集。
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