A teacher is a profession, and a teacher is a title. As a profession, teachers correspond to workers, waiters, drivers and other nouns; As a title, teacher corresponds to a class of nouns such as father, sister, head and doctor.
Because "teacher" is a kind of address, you can address all those who are engaged in teaching as "XX teacher" instead of "XX teacher".
Extended data
Teacher's honorific title: sir
Basic explanation:
1, teacher.
2. honorifics for intellectuals and adult men with certain status.
3. Call someone else's husband or the opposite person your husband (specific usage: all of them are preceded by personal pronouns or attributes; Such as your husband, my husband).
4. People who used to be called bookkeepers. He works as a gentleman in a pawnshop.
In the past, people called storytelling, physiognomy, divination and geomantic omen as occupations. Such as: Mr. Feng Shui.
6. Later this meaning was extended. However, anyone who is highly respected can be called "sir" to show respect, not necessarily referring to men. For example, Soong Ching Ling, Jiang Yang, Bing Xin and Ding Ling can all be called Mr. ..
7. All men can be called gentlemen, such as Mr. Wang and Mr. Li.