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.
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。
The Great Wall of defense is the most important element.
是万里长城防御工程中最为重要的组成部分之一。
Walls are usually viewed as a defense project. What are the key parts of the Great Wall?
城墙一般被看成防御工程，它有哪些重要部位呢？
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