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历史:
ker·nel
\\ˈkər-nəl\\ noun
 ETYMOLOGY  Middle English, from Old English cyrnel, diminutive of corn
 DATE  before 12th century
1. chiefly dialect : a fruit seed
2. the inner softer part of a seed, fruit stone, or nut
3. a whole seed of a cereal
    a kernel of corn
4. a central or essential part : germ
    like many stereotypes…this one too contains some kernels of truth — S. M. Lyman
5. a subset of the elements of one set (as a group) that a function (as a homomorphism) maps onto an identity element of another set

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