Two words or four words to summarize and explain China's traditional revolutionary spirit

Revolutionary spirit refers to the pioneering spirit of the older generation of revolutionaries who have the courage to practice, explore, think and forge ahead, the fighting spirit of suffering, perseverance, tenacious struggle and overcoming difficulties, and the dedication to the cause of the party and the people, which is a valuable asset of the party and the country. Producers in China have their own spiritual pedigree. Great spirits such as Red Boat Spirit, Jinggangshan Spirit, Long March Spirit, Zunyi Conference Spirit, Yan 'an Spirit, Xibaipo Spirit, Hongyan Spirit, the Spirit of Resisting US Aggression and Aid Korea, the Spirit of "Two Bombs and One Satellite", the Spirit of Special Zone, the Spirit of Fighting Flood, the Spirit of Earthquake Relief, the Spirit of Fighting Epidemic and the Spirit of Getting rid of Poverty were formed by generations of China * * * party member and paid a huge price, and they were formed by generations of China.