edge of leaf

例句：

1. 1. The tree's leaf edge is a rich shade of green.
   这棵树的叶边缘是深绿色的。
2. 2. The artist carefully painted the edge of the leaf.
   艺术家小心翼翼地画了叶子的边缘。
3. 3. The scientist studied the edge of the leaf to understand its structure.
   科学家研究叶子的边缘，以了解其结构。