Park下沉庭院实景

Quick answer：

The subject refers to the actual scene of a sunken courtyard within a park. Sunken courtyards are a type of garden design where a courtyard is located below the surrounding ground level, often creating a sense of privacy and seclusion. They are commonly found in traditional Chinese gardens and other cultural landscapes. The term '实景' indicates that this is a real-life depiction or photograph of the courtyard.