你们现在使用的隐形眼镜，与三十年前使用的，已经有天壤之别。

The contact lenses you use today are very different from those used 30 years ago.

youdao

“三十年前，我在为我的明天而反抗。如今，我在为我儿子的明天而斗争。”苏珊如此说道，她现在是两个孩子的妈妈，一直呼吁人们对气候变化引起重视。

"Thirty years ago, I was fighting for my tomorrow. Now, I am fighting for the future of my sons," says Susan, now a mother of two, who has kept calling people's attention to climate change.

youdao

在三十年前的早春，圣海伦斯山开始轰鸣。

In the early spring three decades ago, Mount St. Helens began to rumble.

youdao

And,it used to be that twenty or thirty years ago you'd say nothing in France works, and everything works in the U.S, and now it's just the opposite,totally the opposite.

而在二十或三十年前,你会说法国一片混乱,而美国一切运行顺利,现在则恰恰相反,完全相反

耶鲁公开课 - 1871年后的法国课程节选

Efficient markets" is a theory about-- well it came in about three decades ago, maybe it's closer to four decades ago-- it's a theory that financial markets work very well and incorporate information very well.

有效市场是...,大约三十年前,甚至四十年前,有人提出了这一假说,他认为金融市场运行良好,而且信息披露全透明

耶鲁公开课 - 金融市场课程节选

Things like steel and polymers, or plastics, and ceramics, and of course computers which has progressed remarkably due to the work of engineers in your lifetime, until now you can carry around a cell phone, which would have been unthinkable even 30 years ago.

包括钢铁,聚合物,塑料,陶瓷,当然,计算机这个在你们的有生之年,已经取得令人瞩目的进展的发明,也得归功于工程师的工作,现在你们的手机能随身携带,而这在三十年前是不可想象的

耶鲁公开课 - 生物医学工程探索课程节选