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.
Zhangjiagang City, belonging to Suzhou City, Jiangsu Province, is located in the east of Chinese mainland, on the south bank of the lower reaches of the Yangtze River, connected with Changshu in the southeast, Suzhou and Wuxi in the south, Jiangyin in the west, and the Yangtze River in the north, across the river from Rugao and Jingjiang River. the total area is 986.73 square kilometers, of which the land area is 777 square kilometers and the water area is 195.67 square kilometers. Zhangjiagang City, formerly known as Shazhou, was abolished in September 1986, and Zhangjiagang City was established after Zhangjiagang, a natural good port in the territory. By 2018, there were 8 towns under the jurisdiction of Zhangjiagang City, and there were 7 functional areas with a resident population of 1.2606 million, achieving a GDP of 272.018 billion yuan, of which the added value of the primary industry was 3.063 billion yuan and that of the secondary industry was 1423.6.