求翻译：检索文献1793篇，其中符合纳入标准的文献有716篇，涉及症状2694条，进行归纳总结后，出现频次在30次以上的症状共有34种，是什么意思？

Search the literature 1793, which met the inclusion criteria of literature has 716, involving symptoms 2694, summarized, the occurrence frequency of symptoms in more than 30 times total, 34 species

1793 literature retrieval, of which 716 are consistent with the literature into a standard feature article 2694, involving symptoms, summarized in frequency after more than 30 times the symptoms, there were 34 such

Retrieval literature 1793, in which tallies integrates the standard the literature to have 716, involves symptom 2694, after carries on the induction summary, appears the frequency to altogether have 34 kinds in 30 above symptoms,

Retrieve documents 1793, literature 716 articles which met the inclusion criteria, involving symptoms of 2,694, following a sum, frequency of occurrence in the symptoms of more than 30 times, a total of 34 species,