名词

1. (局势、问题或争论的)要害，核心，要点
The nub of a situation, problem, or argument is the central and most basic part of it.

1. the choicest or most essential or most vital part of some idea or experience

e.g. the gist of the prosecutor's argument
the heart and soul of the Republican Party
the nub of the story

Synonym: kernelsubstancecorecentercentreessencegistheartheart and soulinwardnessmarrowmeatpithsumnitty-gritty

2. a small piece

e.g. a nub of coal
a stub of a pencil

Synonym: stub

3. a small lump or protuberance

Synonym: nubble