Design drawing of下沉式庭院on the first floor

Quick answer：

下沉式庭院，also known as sunken garden, is a type of garden design where the garden is situated below the level of the surrounding ground. This design creates a cozy, secluded space with a view of the garden from above. The design drawing would typically include details such as the layout of the garden, types of plants, hardscaping elements, and pathways.