交河城废弃的原因是多方面的，这里自然环境的沧桑巨变是其中关键的制约因素。
Among the manifold causes of the decline of Jiaohe city, tremendous change of environment is the key element.
交河城的布局和构筑方式，在中外城市建筑史上独一无二，军事防御是交河城构筑特色形成的基本原因。
The structural method of Jiaohe city is unique in the history of city's development both in China and abroad as the purpose of its layout is solely for military defense.
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