The city of Tianjin is one of the four municipalities directly under the central government. Another three are Beijing, Shanghai and Chongqing. As the biggest coastal city in northern China, Tianjin has always enjoyed the reputation of being the 'Pearl of Bohai Sea', Tianjin is a city rich in natural resources and superior culture. As the economic center of the 'Bohai Sea Encircling Zone';, this coastal, open and multifunctional city is home to a wide range of industries and sophisticated technologies.