Lamina molecularis

例句：

1. 1. The lamina of the leaf is thin and transparent.
   叶子的叶脉薄而透明。
2. 2.The lamina is covered in tiny hairs that help to protect the plant from the sun.
   叶子的叶脉上覆盖着细小的毛，有助于保护植物免受阳光的伤害。
3. 3.The lamina folds up when it rains, protecting the plant's roots.
   当下雨时，叶子的叶脉会折叠起来，保护植物的根部。