Aerial view of Shenzhen, S China

Aerial photo taken on April 26, 2018 shows the Shenzhen International Trade Centre Building, on which the construction group set a record of building one story in three days in 1980s, in Luohu District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on May 23, 2018 shows the Luohu District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Sept. 14, 2020 shows the view of downtown areas in Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on March 21, 2018 shows azalea flowers blooming on Wutong Mountain in Luohu District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Photo taken on Oct. 6, 2020 shows the Tencent building in Nanshan District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Liu Dawei)

Aerial photo taken on Sept. 5, 2020 shows Chinese University of Hong Kong (Shenzhen)(down) and the Shenzhen MSU-BIT University (up) in Longgang District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on June 15, 2020 shows the Maozhou River after ecological management in Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Deng Hua)

Aerial photo taken on Aug. 26, 2020 shows the Liantang Port/Heung Yuen Wai Boundary Control Point at the Hong Kong-Shenzhen boundary in south China. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Sept. 17, 2020 shows the Houhai area in Nanshan District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Chen Yehua)

Aerial photo taken on Sept. 27, 2020 shows scenery along banks of the Dasha River in Nanshan District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Sept. 23, 2018 shows the Shenzhen North Railway Station in Longhua District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Sept. 11, 2020 shows the city view of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Photo taken on Oct. 7, 2020 shows the Tencent building in Nanshan District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Liu Dawei)

Aerial photo taken on Sept. 5, 2020 shows the Universiade Stadium in Longgang District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Sept. 20, 2020 shows the Shenzhen Bay Bridge in Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Oct. 2, 2020 shows the citizen center and Lianhua Mountain park in Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Liang Xu)

Aerial photo taken on Oct. 15, 2019 shows the Shekou cruise home port in Nanshan District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on Sept. 14, 2020 shows the city view of downtown Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Photo taken on March 19, 2019 shows the view of the Central Business District (CBD) in Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)

Aerial photo taken on June 13, 2020 shows the Futian District of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Liang Xu)

Aerial photo taken on Sept. 18, 2020 shows the Maozhou River after ecological management in Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Chen Yehua)

Aerial photo taken on Aug. 26, 2020 shows the city view of Shenzhen, south China's Guangdong Province. Known as a paragon of opening-up and development, Shenzhen in Guangdong Province is one of China's earliest special economic zones. Starting from a small town, it has developed into a key economic hub in the past 40 years. (Xinhua/Mao Siqian)