The open-air part of the yard; "Double eaves" refers to purlins at upper and lower eaves; The "children's column" should be a "tubular column", that is, a short column erected on the beam of the house frame; "there is a t-shaped arch under the tail of the beam ... cross" is a kind of bucket arch; "There are no sparrows under the eaves to replace sandalwood …" should be "there are no sparrows under the eaves …". "Bucket arch" is said to be a component invented by Lu Ban, which can turn the bending of material cantilever into compression.
All column foundations are beaded. The bead-shaped column base is a stone waist drum, and the large column base is called "abdominal basin".