为什么美国第二夫人Dr. Jill Biden前面有DR,在此DR是什么含义 英语
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【答案】 教育博士学位,从美国特拉华州大学（也译为德拉华州）获得的,以下是参考文章.
In 2007,at 55,Jill Biden did earn a doctorate -- in education,from the University of Delaware.Since then,in campaign news releases and now in White House announcements,she is Dr.Jill Biden.
Jill Biden has a bachelor's degree from the University of Delaware,master's degrees from West Chester University and Villanova University and a doctoral degree from the University of Delaware.She taught English and reading in high schools for 13 years,and also taught adolescents with emotional disabilities at a psychiatric hospital.From 1993 to 2008,she was an English and writing instructor at Delaware Technical & Community College.Since 2009,she has been an adjunct professor of English at Northern Virginia Community College and is thought to be the first Second Lady to hold a paying job while her husband is Vice President.