主题词群的提取研究是在几个不同的层级上进行的。
The most important research is the extraction of theme words group by the means of making the vocabulary apart.
最终，通过与人工主题词抽取的实验结果相比较，该主题提取模型在查全率和查准率上都取得了较好的效果。
Finally, an experimental was carried out which compared the human subject extraction results to our system result, and the recall and the precision showed that our model do a good job.
通过自然语言处理方法提取相关基因，比主题词途径多且准确。
Contrast to genes extracted from subject headings, relevant genes extracted by natural language processing method are more in numbers and more exact.
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