pure selenium powder

例句：

1. 1. This pure selenium powder is used in the production of solar cells.
   这种纯硒粉用于生产太阳能电池。
2. 2. The pure selenium powder was used to make the paint more durable.
   这种纯硒粉被用来使油漆更耐用。
3. 3. Pure selenium powder is a rare and valuable material that can be used in various applications.
   纯硒粉是一种稀有且有价值的材料，可以应用于各种应用中。