Matches will rarely be perfect,and the owners of the system can vary a sensitivity threshold so as to minimize either the rate of false rejections,which annoy users,or false acceptances,which jeopardize security.

 
  • 对比很少是十全十美的,系统的主人可以改变灵敏度的门限值,以便减少不真实的拒绝(这将使用户恼怒)或不真实的接受(这将破坏安全)。
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