Write a 100 word Zhao Zhouqiao propaganda.

"Millennium Rainbow"-Zhao Zhouqiao was built in Zhao County, Hebei Province, 605-6 18, designed and supervised by famous craftsmen. Zhao Zhouqiao is a single arch bridge, with a total length of 37.02 meters and a solid and magnificent structure. It was the most industrialized stone arch bridge in the world at that time. Zhao Zhouqiao's greatest scientific contribution is to create an "open-shouldered arch" on the two shoulders of the arch. The stability of the bridge has been enhanced. This excellent design has enabled Zhao Zhouqiao to withstand the heavy pressure of p8 earthquake and vehicles for many times in the history of 1400 years, and it is still intact.