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Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Liyang, a county-level city hosted by Changzhou City in Jiangsu Province, is located in the southwest of Jiangsu Province and in the Yangtze River Delta, bordering Jiangsu, Zhejiang and Anhui provinces. It is a member city of Nanjing metropolitan area and an important deputy central city and demonstration area in Nanjing-Hangzhou eco-economic belt. Located in latitude 31 °09 & # 39 north latitude 31 °41 & # 39 Shi, longitude 119o 08 & # 39th east, Yixing in the east, Gaochun and Lishui in the west, Guangde and Langxi in Anhui province in the south, Jurong and Jintan in the north, 59.06km in north and 45.14km in width from east to west, with a total land area of 1535.87 square kilometers. Liyang has a subtropical monsoon climate, dry, wet, cold and warm, four distinct seasons, abundant rainfall, long frost-free period, and the annual average temperature is 17.5.
Airport In Liyang City - Changzhou Benniu International Airport
Changzhou Benniu International Airport (Changzhou Benniu International Airport, IATA: CZX, ICAO: ZSCG), located at the junction of Xinbei District, Changzhou City, Jiangsu Province, China and Danyang City, Zhenjiang City, 18 kilometers away from Changzhou City, is a 4E-class military-civilian transport Airport.  
Changzhou Benniu International Airport was officially completed and opened for civil aviation business on March 15, 1986, named Changzhou Benniu Airport; it was renamed Changzhou Benniu International Airport on September 19, 2014; the second phase of the expansion project was completed in 1996; April 2011 The third phase of the expansion project was completed on the 28th.  
According to information on the airport's official website in October 2018, Changzhou Benniu International Airport has a terminal building, T1 (China's domestic and international Hong Kong, Macao and Taiwan), with a total area of ​​38,000 square meters; a total of 3,400 meters of runway length; apron 160,000 square meters and 20 aircraft seats; it can guarantee an annual passenger throughput of 4.9 million person-times and a cargo and mail throughput of 200,000 tons   ; As of April 2021, Changzhou Benniu International Airport will be open to 32 domestic and foreign cities in China   .
In 2019, the passenger throughput of Changzhou Benniu International Airport was 4.0523 million, a year-on-year increase of 21.8%; the cargo and mail throughput was 33,100 tons, a year-on-year increase of 17.7%; the number of takeoffs and landings was 55,400, a year-on-year increase of 21.4%; 50th, 45th, 57th.  
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