名词
中文翻译：硬度
同义词：
['hardness', 'hardness of', 'hardness to']
例句：
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1.The material has a high case hardness, making it difficult to cut.
这种材料硬度高，很难切割。
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2. The steel is very hard, so it can be used in many different applications.
这种钢非常硬，可以用于许多不同的应用。
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3. The metal has a high hardness, which makes it resistant to wear and tear.
这种金属硬度高，不易磨损。