stomatal number

例句：

1. 1. The plant's stomata are responsible for regulating water and nutrient uptake.
   植物的气孔负责调节水分和养分的吸收。
2. 2.Scientists have discovered new ways to manipulate the stomata of plants for agricultural purposes.
   科学家已经发现了新的技术，可以操纵植物的气孔，用于农业目的。
3. 3. The stomata on the leaves are tiny openings that allow gases to pass through.
   叶子上的气孔是微小的开口，允许气体通过。