Honey, your metaphor is too apt. They really only sell medicine and don't treat diseases. hahaha. You can pay attention to it during the written test or qualification examination to see if there are people who have been admitted to the examiner team to distribute publicity pages. I saw it in the written test before, and then I learned it from the examiner there. The whole class signed up, which was really shocking. If you see it, follow them. Basically, after you finish studying, you will feel that you are completely losing your dimension and hitting your opponent.