Exhibition on China's major scientific accomplishments during 13th Five-Year Plan period held in Beijing (2)

Visitors view the model of a domestic tunnel boring machine at an exhibition on China's major scientific accomplishments during the 13th Five-Year Plan period (2016-2020) in Beijing, capital of China, Oct. 21, 2021. An exhibition showing China's achievements in scientific and technological innovation during the 13th Five-Year Plan period kicked off here on Thursday. (Xinhua/Cai Yang)