单雄蕊式

例句：

1. 1. The flowers on this plant are unisexual, meaning they have separate male and female reproductive structures.
   这种植物的花朵是单性的，意味着它们有独立的雄性和雌性生殖结构。
2. 2. In some species of plants, the flowers are monoecious, with only one type of stamen present.
   在有些植物中，花朵是单性的，只有一种雄蕊存在。
3. 3.The monoecious nature of these plants is a result of their evolutionary history, where males and females were not always present in the same flower.
   这些植物的单性特征是其进化史的结果，因为男性和女性并不总是出现在同一朵花上。