birchen

例句：

1. 3.例句：1. The forest was dense with tall trees and thick underbrush, making it difficult to navigate through.
   森林里树木高大茂密，难以穿越。
2. 2. She carefully planted a few birch saplings in the garden.
   她小心地在花园里种了几棵桦树苗。
3. 3.The birch tree is known for its beautiful white bark and delicate branches.
   桦树以其美丽的白色树皮和纤细的树枝而闻名。