firestone

名词 C2

中文：火石、燧石、耐火石

Iron pyrite, formerly used for striking fire. (countable, uncountable)
A flint. (countable, uncountable)
A heat-resistant stone that will withstand intense heat of a furnace, used for lining kilns, campfire rings, fireplaces and furnaces; especially, the sandstone at the top of the upper greensand in the south of England. (countable, uncountable)

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