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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.

Tai'an City, a prefecture-level city of Shandong Province, is located in the middle of Shandong Province, with the provincial capital Jinan in the north, Jining in the south, Linyi in the east and the Yellow River in the west, with a total area of 7761 square kilometers. It is 66.8 kilometers from the provincial capital Jinan to the north and 74.6 kilometers to Qufu, the holy city of three holes in the south. Taian gets its name from Mount Tai. "Mount Tai is safe all over the world", which means that the country is peaceful and the people are safe. The city is located at the foot of Mount Tai, built according to the mountain, and the mountain city is one. Mount Tai in the territory is a national key scenic spot, with the reputation of "the first of the five mountains" and "the first mountain in the world". It is a world natural and cultural heritage. Tai'an was listed as the first batch of tourist cities open to the outside world by the State Council in 1982. It is one of the central cities in central Shandong, an excellent tourist city in China, and a famous historical and cultural city in China. 2018 CCTV Spring Festival Gala venue for the year of the Dog
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