People began to make it during the Han Dynasty (206 BC-220 AD).

人们在汉代（公元前206年至公元220年）时就开始制作它了。

youdao

During the time of the roman Empire (37 BC-476 AD), it was very difficult to make purple dye.

在罗马帝国时期（公元前37年-公元476年），制造紫色染料非常困难。

youdao

Egypt's Roman era lasted from 30 BC to 337 AD.

埃及的罗马时代从西元前30年一直持续至西元337年。

youdao

We in religious studies tend to like these terms, AD rather than BC, Before Christ, and AD, because AD actually stands for Anno Domini, in the year of our Lord.

在宗教研究中我们喜欢用这两个术语，而不用BC，即“基督前“和，因为AD其实是Anno，Domini的缩写，即“主的年份“

耶鲁公开课 - 新约课程节选

So in simply the interests of reflecting the plurality of our own departments, CE we tend to use these terms, rather than BC and AD.

所以为了表现宗教多样性，我们不用BC和AD，而用BCE和。

耶鲁公开课 - 新约课程节选

The climate was particularly cold in two periods around 800 BC and 1700 AD.

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The drawings - believed to have been made between 700 BC and 900 AD - can only be fully seen from the air.

BBC: News | Americas | Lady of the lines

The vast majority of people lived no better in 1300 AD than in 1300 BC.

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