硝石

例句：

1. 1. The chemist used nitrate to create a new compound.
   化学家使用硝石创造了一种新的化合物。
2. 2. The mine was closed due to safety concerns over the presence of nitrate.
   由于对硝石存在的安全担忧，该矿被关闭了。
3. 3. The scientist discovered that nitrate could be used as a fertilizer for plants.
   科学家发现硝石可以作为植物的肥料。