名词
中文翻译：坚硬
同义词：
['stiffness', 'rigidity']
例句：
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1.The metal is very stiff and difficult to bend.
这金属非常坚硬，难以弯曲。
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2. The car has a lot of rigidity in its design.
这辆车在设计上有很多刚性。
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3. The old tree had a lot of spinosity, but it was still able to withstand the storm.
这棵老树有很多坚硬度，但它仍然能够抵御暴风雨。