例如，亚里斯多德在公元前三世纪曾有一个研究型图书馆。

For example, Aristotle once had a research library in the third century B.C..

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那是在公元前十八世纪。

And that was in the 18th century BC.

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在公元前30年，渥大维自立为帝。

In 30 B. C. Octavian set himself up as emperor.

youdao

在公元前480年春，薜西斯从萨迪斯出发。

In the spring of 480 Xerxes set out from Sardis.

youdao

他在公元前355年左右开始阐明他的故事。

His story began to unfold for him around 355 b.

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征税这一制度至少在公元前3000年就已经出现了。

Taxation has been around since at least 3000 B.

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其中有一尊雕像，她的躯体是在公元前15世纪的历史文物中发现的。

The body of one statue was found among remains dating from the fifteenth century B. c.

youdao

在大约公元前2300年的时候，建成了巨石圈。

In about 2300bc the huge stone circles were built.

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第二个浪潮和公元前1400年崛起的迈锡尼文化在时间上刚好一致；

The second wave coincided with the rise of Mycenaean culture in about 1400 B.

youdao

安蒂基西拉机器是一台设计精密的科学仪器，此机器大约公元前100年在古希腊被制造。

The Antikythera mechanism is a sophisticated, scientific instrument built in Ancient Greece around 100 BC.

youdao

安蒂基西拉机器是一台设计精密的科学仪器，此机器大约公元前100年在古希腊被制造。

The Antikythera mechanism is a sophisticated, scientific instrument built in Ancient Greece around 100 BC.

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