what impact did Zhang Qian's trip have on China and Asian cicvilization

Its trip opened the door of communication between China and the Middle Asia, Western Asia, Europe and other regions in the world. Then the Han Dynasty started to build friendship with the western countries. Meanwhile, the trip accelerated the improvement of Han's culture, economy and trade. His journey laid a solid foundation for Silk Road. Besides, the most important imfact on Asian civilization is that exchange in culture, and trade started due to that!