Why is the bottom of the house in the tropical rainforest is overhanging 'why so built'?

This is adapted to the local environment summarized a housing construction, the local tropical rainforest, relatively humid, such as houses built on the ground floor is not hollow may be flooded during heavy rains, and a variety of venomous insects, snakes can easily enter the house to the occupants of the normal life of a lot of risk, so the local man-made hollow house can solve the above problems. People's wisdom is obtained from practice, so the different styles of building houses around the world is the summary of the historical experience of our ancestors.