droop birch

例句：

1. 1. The old oak treewas so tall that it looked like adowned birch in the forest.
   那棵老橡树非常高，看起来像是森林里的一棵倒下的白桦树。
2. 2.The fallen birch branches were scatteredall over the ground.
   倒下的白桦树枝散落在地上。
3. 3. The fallen birch treeswere a reminder of the harsh winter.
   倒下的白桦树是严酷冬天的一个提醒。