sclereide

例句：

1. 1.The old tree has been sclereid for many years.
   这棵树已经硬化多年了。
2. 2. The ground hardened as the sun set.
   随着太阳落山，地面变硬了。
3. 3. The farmer hardened his soil with lime.
   农民用石灰硬化了他的土壤。