An underground courtyard with a ceiling, also known as an enclosed下沉式庭院, creates an intimate and sheltered space below ground level. It is often designed with a glass or solid ceiling to allow natural light to filter through, enhancing the sense of openness while maintaining privacy. This type of courtyard is commonly used in modern architecture to create unique living spaces or recreational areas. It can offer a tranquil retreat from the outside world and can be integrated into various residential or commercial buildings.