Far away in the Swamp Prefecture.
In recent days, Zhao Yao has been very busy, staying in the backyard of the Prince Mansion, working with Zheng Cheng and others on making cement.
During this period, Zheng Cheng has been working with the craftsmen to make cement, but despite numerous attempts, they have not succeeded, always missing something. Zhao Yao revised several formulas, but still, they weren't successful.
In the past two days, Zhao Yao changed the proportions of the formula and finally made it, but whether it was successful still needed to be tested.
Zhao Yao instructed the craftsmen to use the cement to build a wall, and in a few days, after the cement dried, they would try smashing it to see if it was solid.
Early this morning, Zhao Yao led Zheng Cheng and the others to the wall that had been built a few days ago.
