hard nut

US 
UK 
  • n.棘手的事
  • Web一个难题;硬门槛子;难解决的问题
n.
1.
棘手的事

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard