In Qin'an County, Tianshui City, Gansu, there is a prehistoric site-the Dadiwan Site, dating back 4800 to 8000 years. It is of great value for exploring the clues and original features of Chinese civilization.

Among them, the house building ruins are not only magnificent in scale, but also complex in shape, which is called the "living fossil" of the development history of Chinese prehistoric architecture.

  Recently, a reporter from China News Agency visited the site numbered "F901". In the main room with an area of ​​more than 130 square meters, the ancients smeared grass mud on the support pillars of the house, which was regarded as a fire prevention facility.

At the same time, the ground is made of cement and sand, which is similar to modern cement ground. After research, the chemical composition and physical properties are equivalent to the strength of the current No. 100 cement mortar ground.

According to the guide Ma Lili, this room is mainly used for sacrificial worship.

(Ai Qinglong, Yan Jiao, Jixiang)

Editor in charge: [Zhang Kaixin]