Praising China's 40 years of reform and opening up means praising China's great achievements and progress in the past 40 years, including economic, scientific, technological, educational, cultural and social development. These achievements are the result of China's reform and opening-up policy, which has a far-reaching impact on economy, politics and society. Praising China's 40 years of reform and opening up means appreciating China's efforts and courage, and encouraging China to continue to promote reform and opening up in the future and make greater contributions to the country's prosperity and people's happiness.