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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.

Laishan District, which belongs to Yantai City, Shandong Province, is located in the main urban area of Yantai City, bordering Muping District of Yantai City in the east and south, Fushan District of Yantai City in the southwest, Zhifu District of Yantai City in the northwest, and the Yellow Sea in the northeast. Between longitude 121o 1925 "- 121o 3329" east, latitude 37 °17050 "- 37 °31m 40" north, the maximum east-west distance of the area is 15.9km, and the maximum distance between north and south is 31km, with a total area of 285.43 square kilometers, of which land is 273.6 square kilometers, accounting for 95.9%; water area is 11.8square kilometers, accounting for 4.1 per cent. Laishan District temperate maritime climate characteristics are obvious, sunny, four distinct seasons, no cold in winter, no dry in summer, no hot heat in summer, superior natural environment. The beginning of air environmental quality
Airport In Laishan District - Yantai Penglai International Airport
Yantai Penglai International Airport (Yantai Penglai International Airport, IATA: YNT, ICAO: ZSYT), located in Chaoshui Town, Penglai District, Yantai City, Shandong Province, China, about 43 kilometers away from the center of Yantai, is a 4E-class civil transport airport and a national first-class aviation port   , Member of East China Airport Group   .
Yantai Penglai International Airport officially started construction on December 26, 2009. Its test flight was successful in November 2014, and it officially opened to traffic on May 28, 2015. According to the official website of the airport in February 2019, the airport has a domestic and international terminal area of ​​90,000 square meters, an apron covering an area of ​​400,000 square meters, a runway of 3,400 meters long, and 39 parking spaces, which can meet the needs of large-scale airports such as Boeing 747. The plane took off and landed safely.  
In 2019, the passenger throughput of Yantai Penglai International Airport exceeded 10 million   , an increase of 26.6% year-on-year; the cargo and mail throughput was 41,100 tons, a year-on-year decrease of 4.4%;  
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