kernel
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.