Xi'an, translated in English as "Xi 'an", was translated as "Hsian" and "Sian" in the old days. Xi 'an is one of the world's four ancient civilizations (Xi 'an, Cairo, Rome and Athens). Xi 'an, known as Chang 'an and Jingzhao in ancient times, is known as the "Golden City with a Thousand Miles, the Land of Abundance" in Historical Records, the center of China civilization and East Asian civilization, and enjoys the reputation of "the cradle of Chinese nation". It is not only the birthplace of the Chinese nation, but also one of the important human origins and prehistoric cultural centers in Asia. Founded by Zhou Wenwang, it was built in the 2nd century BC, with an uninterrupted history of urban development of more than 3,111 years. Twenty dynasties and regimes, including Zhou, Qin, Han and Tang, successively established their capitals here. It is the ancient capital of the 13 dynasty (say the 17 dynasty), the political, economic and cultural center of China and the earliest city to open to the outside world. The famous "Silk Road" starts from Xi 'an. In 1981, UNESCO designated Xi 'an as a "world famous historical city". Xi 'an is also known as Xijing, Xidu, Fengcheng and Doucheng, and is called "pickaxe" for short. From ancient times to recent times, they used names: Tanjing, Haojing, Tangao, Xianyang, Chang 'an, Chang 'an, Jingzhao, Daxing, Yongxing, Fengyuan and Xijing, with "Chang 'an" being the most common and famous. Xi 'an, with 21 dynasties and regimes as its capital, is the capital with the largest number of dynasties, the longest time and the greatest influence in the history of China. (yanliang district in Xi 'an itself is also the famous ancient capital of China-Liyang) Among these dynasties, the Han Dynasty and the Tang Dynasty, which once established Chang 'an as their capital, were the most prosperous times in China's history, when Chang 'an was an international metropolis. Chang 'an was the largest city in the world from 195 BC to 25 AD and from 637 AD to 914 AD. At the peak of its development, Chang 'an had a population of more than one million, which was the first city in human history to reach one million. Weiyang Palace in Chang 'an of Han Dynasty and Daming Palace in Chang 'an of Tang Dynasty were the most influential and magnificent palaces in the world at that time, and Tang Daming Palace was also the largest and most magnificent palace in ancient China, with an area of 4.5 times larger than that of the Forbidden City in Ming and Qing Dynasties. Later, other metropolitan cities in the world did not reach or exceed the height that Chang 'an once reached, and this fact remained until the 5th century (the position of the first city area remained even more until modern times). Chang 'an has always been the center of the world in its heyday, attracting a large number of foreign envoys and worshippers. Today, Xi 'an is the capital of Shaanxi Province in the People's Republic of China, one of the 15 sub-provincial cities in China, one of the seven regional central cities in China, the industrial, commercial and financial center in northwest China, the largest central city in the Yellow River basin and the China section of the new Eurasian continental bridge. Xi 'an is also the largest and most important base of scientific research, higher education, national defense science and technology industry and high-tech industry in central and western China, an important machinery manufacturing center and textile industry center in China, a weapon manufacturing base of electronic information industry, and a core base of aviation industry and aerospace industry. It is one of the largest central cities with the strongest scientific and technological strength and the most complete industrial categories in the central and western regions of China. It is a dynamic inland new special zone, a financial center and transportation center in the central and western regions of China and the northern inland regions, a national special zone for overall planning of scientific and technological resources, eight national logistics bases and a comprehensive bonded zone, and the core of Guanzhong-Tianshui Economic Zone. Xi 'an is defined by the state as a modern international metropolis. Reference /view/2155.html? wtp=tt