San Francisco is a port city on the Pacific coast of California, USA. It is a world-famous tourist attraction and the fourth largest city in California. San Francisco is close to Silicon Valley, a world-famous high-tech industrial zone. It is the most important high-tech research and development base in the world and the most important financial center in the western United States. San Francisco has a subtropical Mediterranean climate, with 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 a reserved feast in San Francisco. There are many kinds of food tastes in San Francisco, and Chinese restaurants are an important part of them. San Francisco claims to have the most authentic Chinese food in America, and Chinatown has always been dominated by diners.

Los Angeles is located in the southwest of California. 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 one of the largest petrochemical, marine, aerospace and electronic industrial bases in the United States. There are many world-renowned higher education institutions in Los Angeles, and the famous higher education institutions in greater los angeles area include California Institute of Technology. Los Angeles is one of the important centers of industry and commerce, international trade, science and education, entertainment and sports in the world. In terms of entertainment, Hollywood, California Disneyland and Universal Studios are all located in Los Angeles, and Beverly Hills, a luxury city in Southern California, is also located in the center of Los Angeles, where many international celebrities live.