ringbark

例句：

1. 1. The old oak tree has athick ringbark that is difficult toremove.
   这棵老橡树有一层厚厚的树皮，很难剥掉。
2. 2. Thebark of the tree was rough and dry.
   这棵树的树皮粗糙而干燥。
3. 3.The bark of the tree is rich innutrients for the growth of new shoots.
   这棵树的树皮富含养分，有利于新芽的生长。