We then fly to the historic city of Xi' an for two nights' stay.

之后我们坐飞机去古城西安待两个晚上。

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Just like the Great Wall, the Xi 'an City Wall was originally built for defense, with watchtowers and even a deep moat and drawbridges.

和长城一样，西安古城最开始建造是用于防御，不仅有瞭望塔，甚至还有很深的护城河及吊桥。

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Xi 'an city wall is the best preserved of its kind in China.

西安的城墙是中国古代城墙中保存最完好的一处。

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"It was just like May 12, " Liu Xi, a writer in Ya'an city, said via a private message on his account on the Twitter-like Weibo service.

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