英语单词 professor

英语单词 professor professor associate professor assistant professor visiting professor professor是什么意思 professor是什么意思? 为什么有的英语单词以原音字母开头,但前面还用a,比如：He is a professor of a_ university. institute professor 和sterling professor是什么意思 The Professor音标?RT visiting associate professor是什么意思 associate professor什么意思 distinguished alumni professor是什么意思 professor Waterss是什么意思 professor什么意思? edenfield professor是什么意思 professor什么意思 professor的意思是什么