docent
noun [ C ] uk/ˈdəʊ.sənt/ us/ˈdoʊ.sənt/
（美国或一些欧洲大学的）讲师
in some universities and colleges in the US and Europe, a teacher of a rank lower than a professor
US（博物馆、动物园等的）讲解员
someone whose job is to show people around a museum, zoo, etc. and tell them about the things in it