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San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

Huining County, which belongs to Baiyin City, Gansu Province, is located in the central part of Gansu Province, at the southern end of Baiyin City; the terrain is tilted from southeast to northwest, with undulating beams and ravines; it is a mid-temperate semi-arid climate with a total area of 6439 square kilometers. As of 2018, Huining County has 24 towns and 4 townships under its jurisdiction, with a resident population of 543900. Huining County is known as the "lock key of Qin long". As early as the Neolithic Age more than 5000 years ago, human beings lived and multiplied in the territory. Zuli County was set up in the third year of Emperor Yuanding of Han Dynasty (114BC), which has a history of more than 2100 years. In October of the 25th year of the people's Republic of China (1936), the three main forces of the Chinese Workers' and Peasants' Red Army successfully reunited in Huining, which was the turning point of the Chinese revolution. In 2018, Huining County realized the GDP (GDP).
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