短语
中文翻译：难啃的硬骨头
同义词：
['hard case to crack', 'tough nuts to crack']
例句：
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1.He's a hard nut to crack, and I don't think anyone can solve the problem on their own.
他很难对付，我认为没有人能单独解决这个问题。
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2.The company is facing a hard nut to crack, and it needs a new strategy to overcome this challenge.
公司面临着一个难以解决的难题，需要一个新的策略来克服这个挑战。
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3.The task of solving this hard nut to crack is beyond my capabilities.
解决这个难以解决的难题超出了我的能力范围。