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我们将MeSH主题词抽样输入MEDLINECD～ROM光盘进行实验性检索，每个主题词分别采用两种方式。即“自由”方式和“allSubheadings（含全部副主题词文献）”方式输入检索，发现前者的检索结果均高出后者，从而探明了二者之间的最佳检索方法，尤其是探明了副主题词对主题词查全率的影响。
We will sample MeSH keyword input MEDLINECD ~ ROM disc for experimental retrieval, each keyword used in two ways. That is, “free” way and “allSubheadings” (including all the sub-topic documents) "input retrieval and found that the former are higher than the latter search results, which proved the best retrieval method between the two, especially proved The Influence of Subheadings on the Checkup Rate of Subjects.