nub [nʌb]

例句:

• The nub of the matter is that business is declining.
  事情的实质是工商业在萎缩。
  来自《权威词典》
• That, I think, is the nub of the problem.
  我想那才是问题的要害。
  
• Here we reach the nub of the argument.
  现在我们谈到了争论的核心部分。
  
• A remarkable gift...of grasping the nub of what was going on.
  来自P. Howard
• He picked up a nub of chalk and began to write.
  来自NEWYORKER
• The nub of the matter is, that if and or when we ever find out what it is, I think we are in for a bit of the let down.
  来自SA