1. Concubine Yang loved lychees the most in her life, but the climate in Chang'an was not suitable for growing lychees, so Emperor Xuanzong of the Tang Dynasty could only send people to transport fresh lychees from distant Lingnan to the capital.

2. Lingnan is thousands of miles away from Chang'an, the capital city where Concubine Yang lives. Transportation was inconvenient at that time. In order for Concubine Yang to eat fresh lychees that were full of color, flavor and flavor, she had to send someone to transport the freshly picked lychees. , and quickly transported it to the capital. Therefore, when Concubine Yang saw the dust stirred up by the fast horse, she knew that the lychee was delivered.