对古代、近代和当代信息传递方式的评价..

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古代的狼烟```````烽火``````````虽然能让我们尽快知道情况可是缺少隐蔽性`````````近代的电报``````容易被破译`````````现代就多了`````````像QQ``````邮件`````````还有卫星定位系统`````````比起以往更加快速```安全````````