Always recruiting for the same position, even for half a year. What are the conditions?

It's normal, for example, sales jobs or mechanic jobs are basically recruiting people all year round, and people come and go, and recruitment must be like this. However, other fixed posts are suspected of hanging sheep's heads. For example, I often see recruitment information, saying that I want to recruit a few people, and it has been hanging. This must be false. How many vacancies can there be in a company's personnel position? Generally, sales in the past were all bluff, so pay more attention to your own identification. User in job q: anonymous user.

Before I left my job, my colleague asked me to re-join, and I didn't go back because my salary didn't rise. I have been looking for that job for more than half a year, but I can't find anyone. There are two factors to hang a position, one is the scope of technical work, and the other is the salary. Either the salary can't be given and I can't find a suitable one, or the difficulty coefficient is too high for ordinary people to be competent, and my job is not easy to find. I met a supervisor who worked for ten years and was taken away by a turtle, and then his successors couldn't do well. He requires English training, proficiency in erp system, communication at home and abroad, meeting presiding, project leader, financial background, bachelor degree or above in chemical engineering, and time difference in salary calculation at home and abroad, so when he is busy, he works from noon to late at night, but the tortoise requires to go to work on time every day ... and then he hangs up 1 year, even if he is transferred internally. From Q user: Ms. Xia