1. The protophloem is responsible for transporting nutrients from the leaves to the rest of the plant.
原韧皮部负责将养分从叶子运输到植物的其他部位。
2. During plant development, the protophloem differentiates into specialized cells for efficient nutrient transport.
在植物的发育过程中，原韧皮部会分化为专门的细胞以实现高效的养分运输。