1. First of all, the teacher training level is divided into three levels: primary, intermediate and advanced, which correspond to different professional development stages of teachers.

2. Secondly, the teaching experience is between 2-6 years or has a junior title, the teaching experience is between 7- 16 years or has an intermediate title, and the teaching experience is above 12 years or has a senior title.

3. which stage can be filled in at the end?