tree crystal

例句：

1. 1.The tree crystal is a rare mineral that can be found in the forest.
   树晶是一种稀有矿物，可以在森林中找到。
2. 2. The tree crystal is used in jewelry making to create beautiful designs.
   树晶用于珠宝制作，以创造美丽的设计。
3. 3. The tree crystal has been found to have healing properties for people with arthritis.
   研究发现，树晶对患有关节炎的人具有治疗作用。