From psychological view points, kinds of association include correlated association, similar association, contrary association, causalassociation.
从心理学角度看,联想思维的种类无非是:相关(接近)联想、相似联想、相反(对比)联想、因果联想。
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Extensive studies and data analysis of influenza vaccines have only found a well established causalassociation with the 1976 vaccine that contained an H1N1 swine-influenza-like virus.