What are the characteristics of the two major cities in the United States, San Francisco and Los Angeles?

San Francisco is a port city on the Pacific coast of California, USA. It is a world-famous tourist destination and the fourth most populous city in California. San Francisco is adjacent to Silicon Valley, the world-famous high-tech industrial zone. It is the world's most important high-tech R&D base and the most important financial center in the western United States. San Francisco has a subtropical Mediterranean climate and is home to the world-famous San Francisco Bay Area, Golden Gate Bridge and Fisherman's Wharf. The climate is warm in winter, cool in summer, and sunny. San Francisco is rich in products, and the rich seafood dishes at Fisherman's Wharf have always been San Francisco's reserved delicacies. San Francisco's food tastes are also diverse, and Chinese restaurants are an important part of it. San Francisco claims to have the most authentic Chinese food in the United States, and Chinatown has always been a world of diners.

Los Angeles is located in southwestern California, United States. It is the largest city in California and the second largest city in the United States. Los Angeles has the largest seaport in the western United States and is one of the largest bases for the U.S. petrochemical, marine, aerospace industry and electronics industries. Los Angeles is home to many world-renowned higher education institutions, including the California Institute of Technology. Los Angeles is one of the world's important centers of industry and commerce, international trade, science, education, entertainment and sports. In terms of entertainment, Hollywood, Disneyland California, Universal Studios, etc. are all located in Los Angeles. The luxurious city of Beverly Hills in Southern California is also located in the center of Los Angeles, where many international celebrities live.