| 单词 | a hard/tough nut (to crack) | 
| 释义 | a hard/tough nut (to crack)noun phrase  : a person or thing that is difficult to deal with, understand, or influence  The team's defense is a tough nut to crack. The problem is a hard nut to crack. He's a tough nut, but I think I can get him to agree to the contract. | 
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