What does it mean that the dream of Datang is not all about Chang 'an?

Dream back to the prosperous times, and look back to the Tang Dynasty to appreciate the prosperous times.

1, dreaming back to Datang is dreaming back to the prosperous Datang. Refers to the hope that the country will be restored to the glorious state of the Tang Dynasty, expressing ardent hope for the country and yearning for a better future.

2, dream back to Datang, Jin Goma iron, drunk laughing at the battlefield. Men should strive for self-improvement and prosper our motherland.