ker·nel /ˈkɝnḷ/
  內核核心,中心,精髓
  kernel
  核心
  kernel
  核心 核
  Ker·nel n.
  1. The essential part of a seed; all that is within the seed walls; the edible substance contained in the shell of a nut; hence, anything included in a shell, husk, or integument; as, the kernel of a nut. See Illust. of Endocarp.
     'A were as good crack a fusty nut with no kernel   --Shak.
  2. A single seed or grain; as, a kernel of corn.
  3. A small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh.
  4. The central, substantial or essential part of anything; the gist; the core; as, the kernel of an argument.
  Ker·nel, v. i. [imp. & p. p. Kerneled or Kernelled; p. pr. & vb. n. Kerneling or Kernelling.] To harden or ripen into kernels; to produce kernels.
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  kernel
       n 1: the inner and usually edible part of a seed or grain or nut
            or fruit stone; "black walnut kernels are difficult to
            get out of the shell" [syn: meat]
       2: a single whole grain of a cereal; "a kernel of corn"
       3: the choicest or most essential or most vital part of some
          idea or experience; "the gist of the prosecutor's
          argument"; "the heart and soul of the Republican Party";
          "the nub of the story" [syn: substance, core, center,
           essence, gist, heart, heart and soul, inwardness,
           marrow, meat, nub, pith, sum, nitty-gritty]
       [also: kernelling, kernelled]