Not a liar. Teacher Zang's Second Understanding of Knowledge explains complex knowledge points in a concise and clear way, making learning easier to understand. He can explain abstract concepts clearly with popular language and vivid examples to help students better understand and remember knowledge. Teacher Zang's second understanding of knowledge focuses on grasping the core and key points of knowledge, highlighting key points, helping students to learn more pertinently, refining key concepts and relationships, and enabling students to better understand the context and logic of knowledge.