叶鞘的

例句：

1. 1. The plant's leaves are enclosed in a protective sheath.
   这植物的叶子被一个保护性的鞘包裹。
2. 2. The sheath protects the stem and prevents damage from insects.
   鞘保护茎，防止昆虫损害。
3. 3. The sheath is made of tough material that helps to protect the plant during cold weather.
   鞘由坚韧的材料制成，有助于在寒冷天气中保护植物。