文化变迁的原因有很多，一个社会内部和外部的变动都会促使其文化系统发生适应性变化。
There are many reasons of culture change, for both the internal and external factors can bring about the adaptation in cultural system.
随着时代的变迁和地质情况的变化，古人所列七十二名泉在历代有所变动。
With the changes of dynasties and geological conditions, the 72 springs also changed at different times.
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