资料来源 : pyDict

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资料来源 : Webster's Revised Unabridged Dictionary (1913)

Impregnability \Im*preg`na*bil"i*ty\, n.
   The quality or state of being impregnable; invincibility.

资料来源 : WordNet®

impregnability
     n : having the strength to withstand attack [syn: {invulnerability}]