心皮

例句：

1. 1. The heart of the plant is the ovary, which contains the female reproductive organs.
   植物的心脏是卵巢，包含雌性生殖器官。
2. 2. During fertilization, the male sperm and female egg fuse to form a new embryo.
   在受精过程中，男性精子和女性卵子融合形成新的胚胎。
3. 3. The heart of the flower is the sepals, which protect the petals from damage.
   花朵的中心是花瓣，保护花瓣免受损伤。