Los Angeles (US: /lɔːs ˈændʒələs/ (listen) lawss AN-jəl-əs;[a] Spanish: Los Ángeles [los ˈaŋxeles], lit. 'The Angels'), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world's most populous megacities. Los Angeles is the commercial, financial, and cultural center of Southern California. With a population of roughly 3.9 million residents within the city limits as of 2020, Los Angeles is known for its Mediterranean climate, ethnic and cultural diversity, being the home of the Hollywood film industry, and its sprawling metropolitan area. The city of Los Angeles lies in a basin in Southern California adjacent to the Pacific Ocean in the west and extending through the Santa Monica Mountains and north into the San Fernando Valley, with the city bordering the San Gabriel Valley to its east. It covers about 469 square miles (1,210 km2), and is the county seat of Los Angeles County, which is the most populous county in the United States with an estimated 9.86 million residents as of 2022.
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.