Let college students know and use it in their lives. Third-line spirit is the experience and achievement summed up in the practice of third-line construction, and its spiritual core is hard work, selfless dedication, unity and cooperation, and courage to innovate. These spiritual qualities are of great learning value to the vanguard of students, and are of great help for college students to understand and use these spiritual qualities in their future lives. Meaning refers to the ideas and truths contained in people or things.