The numerous people live in a large number of caves in the east-central of Gansu province.The cave is a kind of green ecological architecture,it not only saves energy but also building material and land.The utilizing of loss caves can let local inhabitants to put a lot of money into education and production for the undeveloped east-central of Gansu province,it can let this region overall development to get better balance and assurance,so the cave still has its value of existence and research.
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