baryta saltpeter

• 钡硝石

baryta saltpeter的用法和样例：

例句

1. Early Chinese scientists discovered that they could make an explosive substance by mixing sulphur, charcoal and saltpeter.
   早期的中国科学家发现把硫磺，木炭和硝石混合在一起可以制作出能够爆炸的物质。