胸针可追溯至公元前4世纪。

The brooch dates back to the fourth century BC.

《柯林斯英汉双解大词典》

公元前221年至公元前210年，他开始修建长城。

Between 221 and 210 B. C., he started the building of the Great Wall.

youdao

至公元前100年左右，丝绸已经成为丝绸之路上的主要贸易商品之一。

Silk had become one of the primary goods traded along the Silk Road by about 100 BC.

youdao

In the years of the Mycenaean period, roughly from 1600 to 1100 or so B.C., you are dealing with a largely unified culture.

在大约公元前一千六百年,至公元前一千一百年,迈锡尼文明时期,你将看到一个高度统一的文化

耶鲁公开课 - 古希腊历史简介课程节选

These are letters that date from the fourteenth century BCE.

这些书信可追溯至公元前14世纪。

耶鲁公开课 - 旧约导论课程节选