红头潜鸭在二十世纪九十年代末被认为已灭绝。

The pochards were believed to be extinct in the late 1990s.

youdao

二十世纪九十年代末，我国正式将教育界定为第三产业，教育作为一种服务的观念得以确立。

At the end of 1990' s, education was officially designated to the brovince of the third industry, which forms the idea that education is a kind of service.

youdao

We've seen the price of oil, lately, move all over the map. It went up to $100 recently and it was just as late as late 1990s that it was under $20 and people just don't know where it's going to go.

我们都能看到现在石油的价格，一路飙升，最近达到每桶一百美元,而在上世纪九十年代末,每桶石油还不到二十美元0,人们根本无法预想石油价格,还会飙升到什么地步。

耶鲁公开课 - 金融市场课程节选