leaf architectural analysis

例句：

1. 1. The tree has many leaves on its branches.
   这棵树的树枝上有很多叶子。
2. 2. The butterfly is perched on a leaf.
   这只蝴蝶停在一片叶子上。
3. 3. The leaves are turning yellow in the fall.
   秋天，树叶变黄了。