Astudyofmorethanfivemillionbooks,bothfictionandnon-fict...
问题详情：Astudyofmorethanfivemillionbooks,bothfictionandnon-fiction,hasfoundamarkeddeclineintheuseofemotionalwordsovertime.TheresearchersformtheUniversityofBristolusedGoogleNgramViewer,afacilityforfind...