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едноезични примери (не са проверени от PONS редакцията)
This was the first clear method for the purification of saltpeter.
en.wikipedia.org However, other saltpeter caves are in private ownership and limited for tourism due to ecological risks.
en.wikipedia.org The cave was mined for saltpeter in the 1800s.
en.wikipedia.org Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from these caves.
en.wikipedia.org In due course, the proportion of saltpeter in the propellant was increased to maximise its explosive power.
en.wikipedia.org