1. word-of-mouth: Hu's class examines students' computing ability, as well as their logical thinking and innovative ability, and has won unanimous praise, while the course of thinking cool is not well-known and has a moderate evaluation.

2. Hu has a wide range of knowledge, rich mathematical knowledge and concepts, and a deep understanding of mathematical theory. The content of "Thinking Cool" course is single, which is not obvious for students to improve and help.