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.
Lhasa, referred to as "La" for short, is the capital of China's Tibet Autonomous region, an international tourist city with plateau and ethnic characteristics, the political, economic, cultural, scientific and educational center of Tibet, and the holy place of Tibetan Buddhism. Located in the middle of the Tibetan Plateau, north of the Himalayas, 3650 meters above sea level (to prevent endogenous oxygen deficiency), is located in the valley plain of the middle reaches of the Lhasa River, a tributary of the Yarlung Zangbo River, which flows through it and flows into the Yarlung Zangbo River in the southern suburbs. Lhasa has sunny weather all year round, with little rainfall, no severe cold in winter, no heat in summer and pleasant climate. The sunshine time of the whole year is more than 3000 hours, which is known as "Sunshine City". Lhasa is rich in all kinds of resources, which has obvious resource advantages compared with other prefectures and cities in the country and the autonomous region. As the first batch of famous historical and cultural cities in China, La