Yes, they have trainers to screen new teachers layer by layer, and then train them to improve. Most of them are old teachers with practical teaching experience and bring new teachers. This "old" is reflected in experience, not the kind of senior teacher in public schools. Otherwise, even if senior lecturers and counselors are hired, they will only talk about theory and guide operation. Teachers have a wide network of contacts, and it is actually quite good for their trainers to train new teachers while teaching students, so they can share the most practical experience with new teachers.