At its peak around AD 600, this city was one of the largest human settlements in the world.

在公元600年左右的鼎盛时期，这座城市是世界上规模最大的人类定居点之一。

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Since around AD 800, whales have been hunted for their oil, meat, and bones.

自大约公元800年起，鲸鱼就因其油脂、鱼肉及骨头而遭猎捕。

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For about 300 years, from around AD 420, Britain's economy functioned without coin.

在从公元420年左右开始的约300年里，英国经济一直在没有钱币的情况下运行。

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Scholars generally believe that he was born sometime around 373 AD in Roman Britain.

BBC: Who was the real St Patrick?

Neither the gospels of Mark (circulating around 75 AD) nor John (100-120AD ) have birth stories.

BBC: Tall tales and pantomime

The Mayan empire flourished in the southern regions from around 250 AD to 900 AD.

UNESCO: Culture