名词
中文翻译：硬度指数同义词
同义词：
['hardness index', 'toughness measurement']
例句：
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1. The engineer used the toughness index to determine the material's strength.
工程师使用硬度指数来确定材料的强度。
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2. The company is using a new method to improve its toughness index.
该公司正在使用一种新的方法来提高其硬度指数。
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3. The researcher found that the increase in toughness index was due to the use of a newadditive.
研究人员发现，硬度指数的增加是由于使用了一种新的添加剂。