在那个年代，书籍是靠手工制作的。

In those days, books were produced by hand.

youdao

在那个年代，上学要交学费，他的母亲没有足够的钱送他去上学。

In those days people had to pay to go to school and his mother did not have enough money to send him.

youdao

在那个年代的巴勒斯坦是地主和农民的社会。

Palestine, in those days, was a community of peasants and landowners;

youdao

We didn't have a clue back then how to explain life in material terms.

在那个年代,我们还不知道如何从物质的角度去解释生命

耶鲁公开课 - 死亡课程节选

But it could also be that it wasn't as easily diagnosed then.

这也同样有可能因为,在那个年代这种病不容易诊断出来

耶鲁公开课 - 生物医学工程探索课程节选

and at a time of popular insurrections in all sorts of countries.

在那个年代,欧洲各国都民怨沸腾,起义不止

耶鲁公开课 - 欧洲文明课程节选