n.白材；白木质；边料
Tough and rich flexibility, alburnum is shown weak ivory, duramen by fallow differ to nigger-brown. 坚韧而富有弹性，边材呈淡乳白色，心材由淡棕色到深棕色不等。
The study objects is ninety standard samples, and then make different experiments according to the duramen and alburnum or transverse section, chordal, radial. 本文用90个规格试件为研究对象，严格按照国家标准按心边材以及横切面、弦切面和径切面分组实验。
