For her doctoral thesis, Elke Rogersdotter studied a 4,000-year-old city called Mohenjo-Daro in the Indus Valley, in what is now Pakistan.

为完成博士论文，艾尔克·罗杰斯多特考察了印度河流域有着4000年历史的古城摩亨佐-达罗，它位于现在的巴基斯坦境内。

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Found at one city was an enormous well-built bath, which may have been a public bath. The world's first urban sanitation systems were found in Harappa and Mohenjo-Daro.

世界上第一个城市公共卫生系统就是在哈拉帕和摩亨佐达罗建立的。

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Today is a long bus day, 12 hours broken by a stop at the ancient great city Moenjo-daro, an ancient Buddhist city, built around 2600bc, and abandoned around 700 years later.

今天的车程很长，在路上有12个小时，只在古代佛教城市Moenjo - daro停了一下。这是一座建于公元前2600年的伟大城市，建成后700年就被废弃了。

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And while Pakistani visitors do still come on public holidays, he says very few foreign tourists visit Mohenjo Daro now.

BBC: Mohenjo Daro: Could this ancient city be lost forever?

Even the Mohenjo Daro museum has been looted, with many of its famous seals (thought to have been used by traders) among the artefacts that were stolen.

BBC: Mohenjo Daro: Could this ancient city be lost forever?

It was the government of Pakistan that was in charge of Mohenjo Daro for decades, but recently responsibility was handed over to the provincial authorities in Sindh.

BBC: Mohenjo Daro: Could this ancient city be lost forever?