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buhrstone英英字典_buhrstone剑桥英语解释_buhrstone柯林斯英文解释_开心英文字典_柠咚词
开心英文字典

buhrstone

B 开头单词

柯林斯词典

    buhrstone (also burstone or burrstone)

  • 1. N a hard tough rock containing silica, fossils, and cavities, formerly used as a grindstone 硅质磨石

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