In some particularly difficult cases, especially network-related problems, this information often plays a key role in tracking down the source.

在某些非常困难的情况下，特别是与网络相关的问题，这些信息常常在跟踪问题来源的任务中扮演重要的角色。

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Word sense disambiguation is one of the difficult problems and a key point in natural language processing.

词义排岐是自然语言处理的重点和难点问题之一。

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Conforming with CNMARC format, this paper discusses the author descriptions and retrieval spots selecting of Chinese trade books and elaborates and analyzes the key and difficult problems.

文章遵循cnmarc格式，对中文普通图书责任者的著录及其检索点的选取进行了探讨，对其中的重点、难点问题进行了阐述和分析。

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