covalent crystal

例句：

1. 1. The structure of acovalent crystal is unique and fascinating.
   共价晶体的结构独特且引人入胜。
2. 2.Covalent crystals are often used inelectronic devices due to their high electrical conductivity.
   由于其高电导性，共价晶体常用于电子器件中。
3. 3.The discovery of new covalent crystalshas opened up new possibilities for materials science.
   发现新的共价晶体为材料科学开辟了新的可能性。