professor Waterss是什么意思

professor Waterss是什么意思 professor是什么意思 institute professor 和sterling professor是什么意思 edenfield professor是什么意思 visiting associate professor是什么意思 德国高校的junior professor是什么意思?相当于assisstant professor, asscocia professor class of 1954 professor of american history是什么意思 英语单词 professor visiting professor associate professor assistant professor