The main content of this episode: The earliest long-distance trade in human history was born on the Silk Road. Long distance trade must meet three conditions: first, means of transportation; second, goods. It requires not only goods for trade, but also goods with high added value; Third, the safety of trade roads should be solved. If trade cannot meet these three conditions, it cannot be established. So, what kind of goods can be called important goods on the Silk Road, what kind of people are the merchants on the Silk Road, and what kind of commercial civilization have they precipitated on the Silk Road for thousands of years? What kind of trade route does the Silk Road condense into? (The Silk Road Economic Belt, Episode V Silk Road, Trade Route)