heart wood

英 美
  • 心材,中心木质,木芯
  • heart n.心;内心;中心;要点;红桃v.将…记在心里,铭记;鼓励
  • wood n.木材;木头;树林
名词 heartwood:
  1. the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood