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)

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 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 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)