polycrystalline silicon

• 多晶硅

polycrystalline silicon的用法和样例：

例句

1. Why is high purity polycrystalline silicon necessary?
   为啥多晶硅需要高纯度？
2. Polycrystalline silicon is an aggregation of small silicon crystals.
   多晶硅是细小硅晶的集合体。