第二部对汉代居延地区候望系统的运作方式进行研究，由侦察与巡逻、烽火传递与烽燧自身的防御等几个方面的内容构成。
The second, research the acting means of presentiment system, this part is consist of spy and patrol signal fire transferring and recovery per se.
但很少有人知道的是，林肯的事迹已经成为了一簇烽火，传递到了世界的其它地方。
What few may know is that Lincoln's example has been a beacon to the rest of the world as well.
每隔一定距离就建造一座烽火台，用来传递军情在长城的整个军事防御体系中，这一切都起着非常重要的作用。
Beacon towers were also built at fixed intervals for passing on military information. All these indicate the important role of the Great Wall in military defense.
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