Chile saltpetre
柯林斯词典
1. N a naturally occurring form of sodium nitrate: a soluble white or colourless mineral occurring in arid regions, esp in Chile and Peru 智利硝石 (Also called soda nitre)
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1. N a naturally occurring form of sodium nitrate: a soluble white or colourless mineral occurring in arid regions, esp in Chile and Peru 智利硝石 (Also called soda nitre)