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. (Photos: Xinhua)

Aerial photo taken on May 23, 2018 shows the Luohu District of Shenzhen, south China's Guangdong Province.

Aerial photo taken on Sept. 14, 2020 shows the view of downtown areas in Shenzhen, south China's Guangdong Province.

Aerial photo taken on March 21, 2018 shows azalea flowers blooming on Wutong Mountain in Luohu District of Shenzhen, south China's Guangdong Province.

Photo taken on Oct. 6, 2020 shows the Tencent building in Nanshan District of Shenzhen, south China's Guangdong Province.

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.

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.

Aerial photo taken on Sept. 17, 2020 shows the Houhai area in Nanshan District of Shenzhen, south China's Guangdong Province.

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.

Aerial photo taken on Sept. 23, 2018 shows the Shenzhen North Railway Station in Longhua District of Shenzhen, south China's Guangdong Province.

Aerial photo taken on Sept. 11, 2020 shows the city view of Shenzhen, south China's Guangdong Province.

Photo taken on Oct. 7, 2020 shows the Tencent building in Nanshan District of Shenzhen, south China's Guangdong Province.

Aerial photo taken on Sept. 5, 2020 shows the Universiade Stadium in Longgang District of Shenzhen, south China's Guangdong Province.

Aerial photo taken on Sept. 20, 2020 shows the Shenzhen Bay Bridge in Shenzhen, south China's Guangdong Province.

Aerial photo taken on Oct. 2, 2020 shows the citizen center and Lianhua Mountain park in Shenzhen, south China's Guangdong Province.

Aerial photo taken on Oct. 15, 2019 shows the Shekou cruise home port in Nanshan District of Shenzhen, south China's Guangdong Province.

Aerial photo taken on Sept. 14, 2020 shows the city view of downtown Shenzhen, south China's Guangdong Province.

Photo taken on March 19, 2019 shows the view of the Central Business District (CBD) in Shenzhen, south China's Guangdong Province.

Aerial photo taken on June 13, 2020 shows the Futian District of Shenzhen, south China's Guangdong Province.

Aerial photo taken on Sept. 18, 2020 shows the Maozhou River after ecological management in Shenzhen, south China's Guangdong Province.

Aerial photo taken on Aug. 26, 2020 shows the city view of Shenzhen, south China's Guangdong Province.