corticopetal

例句：

1. 1.The tree's corticopetal is soft and supple.
   这棵树的树皮柔软而有弹性。
2. 2.The bark of the oak tree is thick and rough.
   橡树的树皮厚而粗糙。
3. 3. The sapwood of the tree is green and alive.
   树的嫩枝是绿色的，充满生机。