Design drawing of下沉 courtyard on the first floor

Quick answer：

The design of a sunken courtyard on the first floor involves creating a courtyard area that is lower than the surrounding ground level. This design can be used to create a visually appealing and functional outdoor space. It often includes considerations for drainage, soil management, and architectural integration to ensure structural stability and aesthetic appeal. Key elements in such a design might include stepped levels, raised garden beds, and landscaping features that harmonize with the overall architectural style of the building.