每隔一定距离，就建一个烽火台，敌人接近时，发出警报。
Beacon towers are built at certain intervals to give the alarm if enemies approach.
这些船每隔一定的距离就会被锚定，它们承载着桥的重量。
The boats are anchored at regular distances and they carry the weight of the bridge.
古代的时候，人们每隔一定的距离就会设定驿站。
In ancient time, courier station would be established at regular intervals.
古代的时候，人们每隔一定的距离就会设定驿站。
In ancient time, courier station would be established at regular intervals.
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