Nowadays, the software radio has become a technique hot spot in the radio com-munication field, especially in the military radio communication field.

目前，软件无线电技术已成为无线电通信领域，特别是军用无线电通信领域的技术热点。

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Nowadays the query optimization technique of XML databases has become a hot research topic in database field, and twig pattern matching is an important problem in XML field.

XML数据库的查询优化技术是当前数据库领域中的一个研究热点，而小枝模式匹配又是其中的一个研究重点。

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Nowadays, with the great speed development of worldwide information science, in the education field, the multimedia technique is more and more permeating in teaching field.

当前，随着世界范围内的信息科学的飞速发展，在教育领域，多媒体正越来越多地渗透于学科教学之中。

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