kernel
/ˈkɜ:nl; `kənl/ n
1 soft and usu edible part inside a nut or fruit stone （坚果或核果的）仁（通常可食）. =>illus at nut 见nut插图.
2 part of a grain or seed within the hard outer shell （谷物去壳後的）粒, 子.
3 (fig 比喻) central or essential part (of a subject, plan, problem, etc) 核心; 要点; 中心
the kernel of her argument 她的论据的核心.