How to write 栾

栾 (luán) 1. A deciduous tree. The leaves contain tannin and can be used to produce tannin glue. The flowers can be used in medicine and also serve as a yellow dye. The wood can be made into implements, and the seeds can be pressed for oil. 2. Curved wood on a column, supported at both ends by brackets. 3. The two corners of a bell mouth. 4. An ancient term the same as "孪," meaning twins. 5. A surname. --- 栾 (luán) 1. A type of wood, also called "栾华" (goldenrain tree). It belongs to the Sapindaceae family. This deciduous tree has feather-like compound leaves with oval leaflets, pale yellow flowers in cone-shaped clusters, and produces capsule fruits that are long and oval. The seeds are round and black, and the leaves contain tannin, which can be used to make tannin glue. The flowers can yield a yellow dye, and they can also be used medicinally. 2. An arch, a load-bearing structure between vertical columns and horizontal beams which forms a bow shape. 3. Synonymous with "孪," meaning twins. 4. A surname. 引: Zhang Heng in "West Capital Ode": "Construct heavy arches to support each other." Note: "Curved wood on the column, with both ends supported." 例: For example: "栾拱" (the curved wood supporting the beams in the roof frame); "栾栌" (the wood on top of the pillar in the house supporting the beam, where the curved piece is '栾' and the straight piece is '栌').