The reader's vocabulary is completely confusing.

For some data errors, this reason may be the reason I said. I've done some reading. Sometimes local agents are in a hurry to read textbooks. In a short time, the librarian finished writing and hung it on the company website for customers to download and use. So, there are many problems. Because there must be many mistakes without repeated testing and correction. The same was true of my previous company. We have to pass three tests to finish a book. Then hang it on the website for customers to download. Sometimes urgent books are assembled and then hung directly. Maybe what you see is the data at this time.