Visitors view a model of China's manned submersible Jiaolong displayed at a major exhibition to commemorate the 40th anniversary of China's reform and opening-up held at the National Museum of China in Beijing, capital of China, Nov. 18, 2018. The exhibition has attracted more than 190,000 visitors since it opened on Nov. 13. (Xinhua/Cai Yang)

　　Visitors look at the space suit displayed at a major exhibition to commemorate the 40th anniversary of China's reform and opening-up held at the National Museum of China in Beijing, capital of China, Nov. 18, 2018. The exhibition has attracted more than 190,000 visitors since it opened on Nov. 13. (Xinhua/Cai Yang)

　　Visitors look at a wall of vintage cassette tapes displayed at a major exhibition to commemorate the 40th anniversary of China's reform and opening-up held at the National Museum of China in Beijing, capital of China, Nov. 18, 2018. The exhibition has attracted more than 190,000 visitors since it opened on Nov. 13. (Xinhua/Cai Yang)

　　Visitors look at typical clothes of generations over the past four decades displayed at a major exhibition to commemorate the 40th anniversary of China's reform and opening-up held at the National Museum of China in Beijing, capital of China, Nov. 18, 2018. The exhibition has attracted more than 190,000 visitors since it opened on Nov. 13. (Xinhua/Cai Yang)

　　Visitors look at sculptures featuring farmers of Xiaogang Village of east China's Anhui Province, who signed an agreement paper to de-collectivize farmland, displayed at a major exhibition to commemorate the 40th anniversary of China's reform and opening-up held at the National Museum of China in Beijing, capital of China, Nov. 18, 2018. The exhibition has attracted more than 190,000 visitors since it opened on Nov. 13. (Xinhua/Cai Yang)