问题详情

Mankind uses methods both primitive and complex to protect what he holds dear.Today,twenty-first century technology safeguards our most precious possessions.Night vision cameras and infrared sensors seek out intruders.Computers measure the minute details of fingers,eyes and faces to ensure positive identification.Three dimensional holograms verify the authenticity of valuables from currency to fine cigars.Invisible electronic tags identify and track valuable works of art.But even the most sophisticated machines rely on the skill and honesty of their human masters.