1. The pronunciation of ancient Chinese is based on the pronunciation of ancient Chinese, the residual sound of ancient Chinese in local pronunciation and the phonology of the Book of Songs. Therefore, the pronunciation of ancient Chinese is controversial, but the pronunciation of middle Chinese is certain, so it is a bit like Russian.
2. According to time, ancient Chinese can be divided into four types: ancient Chinese in the Shang Dynasty, ancient Chinese in the Zhou and Qin Dynasties, ancient Chinese from the Wei, Jin, Southern and Northern Dynasties to the Southern Song Dynasty, and ancient Chinese from the Ming Dynasty to the May 4th Movement. It sounds more like a combination of Chinese, Russian and Vietnamese, and the poems read in ancient Chinese have a unique flavor.