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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Changshan County, which belongs to Quzhou City, Zhejiang Province, is located in the west of Zhejiang Province, the western part of Jinqu Basin and the upper reaches of Qiantang River, with geographical coordinates between 118 °41 °51 "~ 118 °56 °50" east longitude and 28 °49 °49 "north latitude. It is bordered by Kecheng District, Qujiang District, Jiangshan City, Kaihua County, Chun'an County of Hangzhou City and Yushan County of Shangrao City, Jiangxi Province. It is known as" the thoroughfare of four provinces and the first station of two Zhejiang provinces ". By the end of 2018, the county has a total area of 1099.07 square kilometers and has jurisdiction over 6 towns, 5 townships and 3 streets, 180 administrative villages with a population of 344200. In the 23 year of Jian'an in the Eastern Han Dynasty (218), it was called Dingyang; in the fifth year of Xianheng in the Tang Dynasty (674), Fenxinan located Changshan County in the original Dingyang County, and Changshan was located in the south of the county.
Airport In Changshan - Quzhou Airport
Quzhou Airport (Quzhou Airport, IATA: JUZ, ICAO: ZSJU), located at the junction of Minhang Avenue and Qujiang District, Xin'an Street, Kecheng District, Quzhou City, Zhejiang Province, China, 2 kilometers west of Quzhou City, is a 4C-level military-civilian regional airport   .
In 1933, Quzhou Airport was completed and opened to navigation, and it was a military airport; on May 10, 1992, Quzhou Civil Air Station was established; on November 26, 1993, Quzhou Airport officially opened for civil aviation business   ; In 2020, the relocation site of Quzhou Airport was approved   .
As of February 2021, the terminal area of ​​Quzhou Airport is 3,440 square meters, and there are 4 C-class seats on the civil aviation apron; the runway is 2,600 meters long and 45 meters wide; it can meet the annual passenger throughput of 500,000 passengers.     .
In 2021, Quzhou Airport will handle a total of 470,235 passengers, a year-on-year increase of 21.8%, ranking 131st in the country; cargo and mail throughput will be 1,003.5 tons, a year-on-year increase of 43.5%, ranking 120th in the country; Increased by 32.8%, ranking 147th in the country   .
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