1. Rotunda east balcony camera.圆形大厅东面阳台的摄像头。youdao2. The vast rotunda space can hold eight million books.它的圆形大厅里藏有八百万册书籍。youdao3. The vast rotunda space can hold eight million books.它的圆形大厅里藏有八百万册书籍。youdao