Photo taken on Sept. 17, 2020 shows an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Jin Liangkuai)

A staff member demonstrates an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

Photo taken on Sept. 17, 2020 shows an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Jin Liangkuai)

A man watches a positive pressure sample collecting cabin at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

People watch an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

People watch a robot at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

Photo taken on Sept. 17, 2020 shows an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Jin Liangkuai)

People watch a robot at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

A man tries an optical display module of a pair of AR glasses at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

A staff member demonstrates an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)

An exhibitor demonstrates a protective suit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Jin Liangkuai)

A staff member demonstrates an exhibit at the 23rd China Beijing International High-tech Expo in Beijing, capital of China, Sept. 17, 2020. The high-tech expo kicked off in Beijing on Thursday, showcasing the latest technological achievements. (Xinhua/Ju Huanzong)