saltpetre
noun [ U ] UK (US saltpeter) uk/ˌsɒltˈpiː.tər/ us/ˈsɑːltˌpiː.t̬ɚ/
硝石，钾硝，硝酸钾
a salty-tasting white powder used to preserve meat, and also used in producing explosives and fertilizers (= substances that help plants grow)
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