drooping birch

例句：

1. 1. The drooping birch tree is a symbol of the forest's decay.
   这棵倒挂的桦树是森林衰败的象征。
2. 2.The drooping birch branches are covered in snow and ice.
   倒挂的桦树枝上覆盖着雪和冰。
3. 3. The drooping birch trees were once a thriving forest, but now they are struggling to survive.
   倒挂的桦树曾经是一个繁荣的森林，但现在它们正在努力生存。