cuticle of internal root sheath

例句：

1. 1.The cuticle of the leaf is a protective layer that helps to keep the plant from drying out.
   叶子的角质层是一种保护层，有助于植物保持水分。
2. 2. The cuticle of the skin protects the body from bacteria and other foreign invaders.
   皮肤的角质层保护身体免受细菌和其他外来入侵者的侵害。
3. 3. The cuticle of the hair is made up of keratin, which makes it strong and waterproof.
   头发的角质层由角蛋白组成，使其变得坚韧且防水。