子叶下轴

例句：

1. 1. The plant's root system is composed of a central axis and several sub-axial roots.
   这植物的根系由一个中心轴和几个子轴根组成。
2. 2. During the development of the fruit, the seeds are embedded in the sub-axial layers of thefruit.
   在果实发育过程中，种子被嵌入果实的子轴层中。
3. 3. In the process of photosynthesis, the plant absorbs carbon dioxide from the atmosphere through the sub-axial layers ofits leaves.
   在光合作用过程中，植物通过叶子的子轴层吸收大气中的二氧化碳。