What is the meaning of the ancient poem "Remembering the Past"?

Secondly, recalling the heyday of Kaiyuan, there were thousands of families in the small town. Rice is fat and white, and public and private warehouses are rich. There are no wolves and tigers on the road in Kyushu, which is a good day to travel. Wan Qi, Lu Mao, driver class, male plow female mulberry. The sage in the palace plays the cloud gate, and all friends in the world are sticky. There has been no catastrophe for more than 100 years, and Uncle Sun has learned Xiao He's law. Do you smell a piece of silk worth 10 thousand yuan? Today, a field is bleeding. Luoyang Palace was burnt out, and the Fox and Rabbit Cave was newly demolished in the ancestral hall. I can't bear to ask my age, but I'm afraid I'll leave at the beginning. My junior minister, Lu Chong, was powerless, and the imperial court remembered his official title. Zhou Xuan zhongxing looked at my emperor, spilling blood and Jianghan was weak.

Recalling Xuanzong of Tang Dynasty is a prosperous time of Kaiyuan, with the purpose of encouraging Daizong to restore its past prosperity, rather than recalling the past for the sake of recalling the past.

This year's harvest is very good. ) Rice, millet and other grains grow as white and rich as grease, and state-owned and private grain depots are full of grain. There are no exorbitant taxes and bandits all over the country, and the people live a stable and happy life every day. Therefore, even if they want to travel far away, there is no need to find the so-called "auspicious day of the zodiac" for the imperial calendar to travel. ..........