San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Pingchuan District is a municipal district under the jurisdiction of Baiyin City, Gansu Province, which is located in the north of the middle of Baiyin City, Gansu Province. The general characteristics of the topography of Pingchuan District are high in the southeast and low in the northwest, tilting from the southeast to the northwest. The total area is 2106 square kilometers and the population is 209000 (2016). Pingchuan District has jurisdiction over 4 streets, 4 towns and 3 townships. Pingchuan is an important coal and electricity energy base in Gansu, with an annual output of more than 12 million tons of high-quality raw coal and 13 billion kilowatt-hours of electricity generation. Pingchuan is the largest ceramic production base in northwest China, with clay reserves of more than 4 billion tons and annual output of nearly 20 million square meters of wall and floor tiles. Pingchuan has been awarded "China Ceramic Industry transfer demonstration Base" by China Ceramic Industry Association. In 2009, Pingchuan District won the title of Advanced Zone of Scientific and technological Progress in China. In 2016, Pingchuan District achieved regional health throughout the year.