This Cold War-Era intrusion-detection system was designed to blend in with the terrain and could detect movement of people, animals or objects up to 300 meters away.
这款冷战时期的侵入侦测系统旨在与周围环境融为一体，它能够探测300米之外的任何活动物体。
2
The last ice age in about ten thousand years ago has just ended, and the weight of the ice movement had a profound influence on the terrain here.
最近一次的冰川期仅在大约一万多年前才刚刚结束，冰层的重量和移动对这里的地形有着深远的影响。
3
But what if you have terrain that is walkable, but at a higher movement cost?