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.
为控制托盘以稳定速度下滑，避免撞击，在滚筒线上每隔一定距离设置一套阻尼系统。
To control the tray down a steady pace to avoid collision, in the drum line at intervals of a certain distance from one set of damping system.
在瑞典，游客们根本不用劳神到处去寻找电话，主要街道和公路上每隔一定距离便会有一个电话亭。
A traveler never needs to search for a telephone is Sweden: telephone booths are placed at regular intervals along the main streets and highways.
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