The Xi'an City Wall is the most complete city wall that has survived China's long history.

西安城墙是中国历史上保存最完整的城墙。

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It took us about 3 hours to go all the way around the Xi'an City Wall.

我们花了大约3个小时走完了西安城墙。

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When was the ancient city wall we've seen in Xi'an expanded?

我们现在所看到的西安古城墙是什么时候扩建的？

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