它具有化学结构检索和文字检索两大检索功能，并便于数据库维护、中文处理、图形存贮和使用方便等特点。
It is satisfied in maintenance of database, treatment of Chinese text and storing of graph. It is easy to use.
结构检索方法建立在图子图匹配算法VF 2的基础上，对其进行了必要的改造和扩展，使之适合于化学结构检索。
The VF2 graph matching algorithm on which the chemical structure search system was based has been modified and extended appropriately.
这主要是由于反应数据库基于结构的检索方法与化学家解决问题的方法相去甚远。
The main reason is that the current reaction databases are based on substructure searching which is an approach quite different from that chemists often use.
本文从传统的检索工具《生物学文摘》、《化学文摘》、《工程索引》入手，介绍各自的概况、结构以及它们的网络版的特点。
The paper start with the conventional search tools:,. It introduce general situation, structure and the characteristic of network.
本文从传统的检索工具《生物学文摘》、《化学文摘》、《工程索引》入手，介绍各自的概况、结构以及它们的网络版的特点。
The paper start with the conventional search tools:,. It introduce general situation, structure and the characteristic of network.
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