the end of a leaf and branch of a plant

例句：

1. 1. The tree has many leaves that turn color in the fall.
   这棵树有很多叶子，秋天时会变色。
2. 2. She picked a leaf from the bush to make a bookmark.
   她从灌木丛中摘了一片叶子做书签。
3. 3. The scientist studied the leaves of different plants to understand their growth patterns.
   科学家研究不同植物的叶子以了解它们的生长模式。