quintessence
/kwɪnˈtesns; kwɪn`tɛsns/ n[sing]
the ~ of sth (fml 文)
1 essential part of (a theory, speech, condition, etc) （理论、 讲话、 条件等）的精髓, 精华
Her book captures the quintessence of Renaissance humanism.她的书抓住了文艺复兴时期人文主义的精髓.
2 perfectexample of (a quality) 典范
He is the quintessence oftact and politeness. 他处世谦恭得体.