Top-20 keyword pairs that have been found most time in 20 years and their growth.
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https://figshare.com/articles/dataset/_Top_20_keyword_pairs_that_have_been_found_most_time_in_20_years_and_their_growth_/1395221
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资源简介：
Top-20 keyword pairs that have been found most time in 20 years and their growth.
创建时间：
2015-04-27
