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tough nut

US 
UK 
  • Web强硬的疯子;硬核桃;坚硬的核心
Plural Form:tough nuts  

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