crystalline-amorphous transition

例句：

1. 1. The material is amorphous and has no crystalline structure.
   这种材料是无定形的，没有晶体结构。
2. 2. The amorphous substance is difficult to process and requires special handling.
   这种无定形物质难以加工，需要特殊处理。
3. 3. The amorphous nature of the material means it can be molded into various shapes.
   这种材料的无定形特性意味着它可以被塑形成各种形状。