Tiancheng下沉式庭院effect drawing

Quick answer：

A 'Tiancheng下沉式庭院effect drawing' refers to an illustration or visual representation of an underground courtyard designed by Tiancheng, likely showcasing its architectural features and design elements. This could be part of a project proposal or an architectural portfolio. The term '下沉式庭院' means an underground courtyard, which is an architectural feature often used in traditional Chinese gardens to create a sense of privacy and a harmonious blend of nature and architecture.