当将厚密的植被除去并耕种时，潮湿热带地区的土壤就会迅速失去其肥力。
When cultivated and stripped of their dense vegetative cover, soils of the humid tropics quickly lose their fertility.
锥状喀斯特是湿热带地区重要的喀斯特地貌景观类型和高品位的旅游资源。
The karst cave is a very important landscape and high grade traveling resource in the cone karst area.
最少观察到遭到自然选择的是生活在潮湿热带气候地区的人们，这些地区是人类祖先的栖息地。
The fewest signals of selection were seen among people who live in the humid tropics, the ecoregion where the ancestral human population evolved.
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