amorphous cortex

例句：

1. 1. The amorphous material is difficult to mold.
   这种无定形材料很难塑形。
2. 2. The amorphous structure of the crystal is not well understood.
   晶体的无定形结构尚未充分理解。
3. 3. The amorphous region in the sample is due to impurities.
   样品中的无定形区域是由于杂质造成的。