nub

n.

小块；瘤；结节；要点

1. Indeed, this is the nub of the nurturists' argument.
   确实，这就是营养学家们的争端所在。
2. The nub of the problem is our poor export performance.
   问题的关键是我们出口贸易方面太差。

Variation in locomotion between laboratory strains of Trichogramma maidis and its impact on parasitism of eggs of Ostrinia nubilali...
Nub assembly for tent frame struts
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