hydroxyapatite crystal

例句：

1. 1.The hydroxyapatite crystals are used in orthopedic surgery to help repair bone fractures.
   羟基磷灰石晶体用于骨科手术，帮助修复骨折。
2. 2. The mineral is found in nature and can be found in the bones of many animals.
   这种矿物在自然界中存在，许多动物的骨骼中都能找到它。
3. 3.The hydroxyapatite crystals have been studied for their potential use in drug delivery systems.
   羟基磷灰石晶体已被研究，以探索其在药物输送系统中的潜在用途。