How Kingdoms Yan,Zhao and Qin of the Warring States Exercised Control and Jurisdiction over Part of the Present-Day Area of Inner Mongolia;

The tranguility of private gardens in ancient Chinese times provided a good environment for people to read books, drink tea, play chess, play stringed instruments, etc.

Thus it enriches the cultural meanings of "swallow".

Swallow Song and Song of Waiting——The Musical Massages Contained in Generative Fables of Chinese Poetry;