1. Limestone cliffs; limestone walls. 
   石灰岩峭壁；石灰岩墙
2. terrain-tracking radar and terrain-avoidance radar 
   地形跟随和地形回避雷达
3. One who is skilled in topography. 
   地形学者精通地形学的人
4. A bowl-shaped topographic depression. 
   盆地碗状地形凹陷
5. The whole landscape looked as flat as a pancake. 
   整个地形十分平坦.

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