n.硝石；硝酸钾

He used saltpeter to cure the meat.
他用硝石腌制肉。
The gunpowder was made from saltpeter, sulfur, and charcoal.
火药由硝石、硫磺和木炭制成。
Saltpeter is an essential ingredient in fertilizer.
硝石是肥料的重要成分。
She found a lump of saltpeter hidden in the wall.
她在墙里发现了一块藏匿的硝石。
They extracted saltpeter from the mine for industrial use.
他们从矿井中提取硝石用于工业。
The old house had been used to store saltpeter in the past.
那座老房子过去被用来储存硝石。
Saltpeter can be found naturally in some arid regions.
在一些干旱地区可以自然找到硝石。
The soldiers were issued guns loaded with saltpeter-based powder.
士兵们得到了装有硝石粉末的枪支。
Farmers used to apply saltpeter to their fields to improve crop yields.
农民过去常常在田里施用硝石以提高作物产量。
The discovery of a large deposit of saltpeter changed the town's economy.
发现了一个大储量的硝石改变了这个小镇的经济。