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An instrument for determining the hardness of materials by measuring the height of rebound of a small diamond-tipped hammer dropped on to the material from a standard height.
春雷网英语在线翻译词典收录了464360条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。