1. endless learning: "endless learning" is an idiom, which means that the road to learning is endless. It emphasizes the importance and infinity of learning and reminds people not to stop learning and exploring. This idiom suits teachers.

2. Unity of knowing and doing: "Unity of knowing and doing" is an ancient philosophical saying, which means unity of knowing and doing. It emphasizes the close relationship between knowledge and action, and holds that only by applying the learned knowledge to practice can we truly master and understand this knowledge. This idiom suits teachers.

3. Instructor: "Instructor" is an idiom, which means someone who teaches puzzles. Usually used to describe those who can impart knowledge, solve problems and guide students to learn, such as teachers and tutors. This nickname is also suitable for teachers.