资料来源 : pyDict

易攻击的,有弱点的

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

Pregnable \Preg"na*ble\, a., [F. prenable. See {Impregnable}.]
   Capable of being entered, taken, or captured; expugnable; as,
   a pregnable fort. [R.] --Cotgrave.