名词
中文翻译：刚度指数
同义词：
['stiffness', 'rigidity']
例句：
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1.The stiffness index of the material is crucial for its performance.
材料的性能取决于其刚度指数。
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2.In engineering, the stiffness index is used to measure the resistance of materials to deformation.
在工程中，刚度指数用于测量材料抵抗形变的能力。
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3. The stiffness index is an important factor in determining the strength and durability of a structure.
刚度指数是决定结构强度和耐久性的一个重要因素。