According to the national standard of Chinese stone classification, the stone is divided into five categories: marble, granite, travertine, sandstone, slate. In practical applications, the following types of stones are often used
The villa, that is, a separate occupation, is a residence for enjoying life outside of the residence, it is the second residence, not the first residence. Tracing its origin, there is no clear starting point in time. In ancient my country, villas also appeared very early.