| 单词 | a hard nut to crack/ a tough nut to crack | 
| 释义 | a hard nut to crack/ a tough nut to crack phrase [usually verb-link PHRASE]   See full dictionary entry for  nut If you say that something is a hard nut to crack or a  tough nut to crack, you mean that it is difficult to do or to understand.  [informal]  Getting out there is in many ways the hardest nut to crack.    | 
	
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