Almost all university teachers can fully accept the title of "teacher", and many genuine professors prefer students and colleagues to call him "teacher". Of course, it is always the safest way to call him "professor" when you are unfamiliar with the other person's preferences or when you meet for the first time.

Now the streets are full of teachers Zhang and Ga on the phone, so a noun that used to have a lot of connotations, like the address of miss, has deteriorated, so this address can be used, but it is useless. Teachers are rare in the daily language of university life, and are generally used for official announcements, such as Teachers' Day, teachers' responsibilities and teachers' quality.

Professors are the most popular in universities. Whether you are a professor or an associate professor (or even a lecturer), it is very useful to be called a "professor" (there are exceptions in general psychology). This is not language corruption, because they are assistant professors in the United States (assistant professors, the kind who just entered the university).

Associateprofessor and professor also teach professors (deliberately adding assistants is also a waste of speaking time). Even in formal occasions, it is so concise (if printed on paper, add assistant, associate).