The main usage are:
1, teachers, teachers, educators, learned men and women can call it this in ancient times.
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, Ding Ling, Ye Man and Xu Guangping can all be called Mr. ..
7. Now all men can be called Mr., such as Mr. Wang and Mr. Li.
8. Another name for a doctor: For example, "I am sick to see a doctor."