The family made their money in the 18th century.

这个家族在18世纪创下了家业。

《牛津词典》

They can trace their lineage back to the 18th century.

他们的家族可以直接追溯到18世纪。

《柯林斯英汉双解大词典》

I had another spontaneous miscarriage at around the 16th to 18th week.

在大约第16至18周时我又一次自然流产了。

《柯林斯英汉双解大词典》

This was the second consecutive year North Carolina made it to the Final Four and its record 18th appearance.

VOA: standard.2009.04.05

But, I give a lot of credit to the European politics of the late 17th and 18th century.

但是，我觉得很大程度上得益于欧洲政治,在17世纪末和18世纪，起的作用。

普林斯顿公开课 - 人性课程节选

So I would say the tradition goes back to the 18th century not even to the constitution.

我认为这个传统可以回溯到,十九世纪，甚至在宪法出现之前。

普林斯顿公开课 - 人性课程节选

Since the 18th Century, women in London have been excluded from traditional gentleman's clubs.

BBC: London��s first female-only club

Most of the buildings visitors see today, though, date back to the 18th Century.

BBC: Beijing's once Forbidden City

Lately, the repopularization of old-fashioned lines has caused prices of the 18th-century seats to leap.

FORBES: Coming Attractions