名词
中文翻译：Unknown
同义词：
['stubborn', 'inflexible', 'unyielding']
例句：
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1. The old man was known for his stubbornness and unwavering determination.
这位老人以其顽固和坚定不移的决心而闻名。
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2. The rock is incredibly hard and can withstand heavy loads.
这块岩石非常坚硬，能够承受重载。
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3. Despite her efforts to change, she remained stubbornly committed to her beliefs.
尽管她努力改变，但她仍然顽固地坚持自己的信念。