xylostroma

例句：

1. 1. The tree's bark is made up of layers of xylostroma.
   这棵树的树皮由木栓质层组成。
2. 2.Xylostroma is a type of plant tissue that stores water and nutrients.
   木栓质层是一种储存水分和养分的植物组织类型。
3. 3. The growth of the tree depends on the health of its xylostroma.
   这棵树的生长取决于其木栓质层的健康状况。