--FILE--Cityscape of the high-rising buildings in Shenzhen city, south China's Guangdong province, 22 April 2019. China will build the southern city of Shenzhen into a pilot demonstration area of socialism with Chinese characteristics, a document said Sunday (18 August 2019). The building of the demonstration area will help deepen reform and expand opening-up comprehensively, according to the document issued by the Communist Party of China Central Committee and the State Council. It is also conducive to the implementation of the Guangdong-Hong Kong-Macao Greater Bay Area plan and the fulfillment of the Chinese dream of national rejuvenation. By 2025, Shenzhen will become one of the leading cities in the world in terms of economic strength and quality of development. Its research and development input, industrial innovation capacity, and the quality of its public services and ecological environment will be first-rate in the world, according to the document.