common leaf of alfalfa

例句：

1. 1.The common leaf of the tree is a symbol of life.
   这棵树的普通叶子是生命的象征。
2. 2. The scientist collected samples from different parts of the plant to study its structure and function.
   这位科学家从植物的不同部位收集样本，以研究其结构和功能。
3. 3. The common leaf was used as a natural insulator in ancient times.
   古代，这种普通叶子被用作天然绝缘材料。