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英语单词“hardness”的意思是硬度，读音为英 [ˈhɑːdnəs] 美 [ˈhɑːrdnəs]。以下是一些含有“hardness”的例句：
1. This diamond has a very high hardness. （这种钻石的硬度非常高。）
2. Water has a relatively high hardness. （水的硬度相对较高。）
3. The steel produced by this method has good hardness and toughness. （用这种方法生产出来的钢具有优良的硬度和韧性。）
4. She is known for her tenacity of purpose and high degree of hardness. （她以自己目标坚定和很高的硬度而著称。）
5. She is not easy to persuade, she is very hard. （她不容易被说服，非常固执。）
6. The quality of the steel is affected by its hardness. （钢的质量受其硬度的影响。）
7. The metal has a high degree of hardness and wear resistance. （这种金属具有很高的硬度和耐磨性。）
8. The stone has a hardness of 10 on the Mohs scale. （这种石头莫氏硬度为10。）
9. She has a hardness of character that means she never gives up easily. （她的性格很坚韧，意味着她从不轻易放弃。）
10. The hardness of the rock was measured using a penetrometer. （使用刻划硬度计测量岩石的硬度。）
总的来说，“hardness”是一个形容词，表示硬度、坚硬、顽固等含义。在口语和书面语中都可以使用。
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