名词
中文翻译：球硬度
同义词：
['hardness', 'density']
例句：
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1.The ball is made of rubber and has a high hardness.
这个球是用橡胶做的，硬度很高。
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2. The material has a low hardness and can be easily deformed.
这种材料硬度低，容易变形。
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3.The hardness of the material affects its strength and durability.
材料的硬度影响其强度和耐用性。