2000万年前，爱达荷州不像现在这样干旱。确切地说，它那时温暖潮湿，生长着茂密的原始森林。

Twenty million years ago, Idaho was not the arid place it is now. Rather, it was warm and damp, populated by dense primordial forest.

《柯林斯英汉双解大词典》

现在的北美大陆和欧洲大陆大约在40亿年前是连接在一起的，在那时，加勒多尼亚山脉与现代的喜马拉雅山脉一样雄伟。

About 400 million years ago, when the present-day continents of North America and Europe were joined, the Caledonian mountain chain was the same size as the modern Himalayas.

youdao

去医院前的晨间散步是一段安静祥和的时光，我可以在那时整理我的思绪。

The walk in the morning before I headed to the hospital was a quiet, peaceful time to gather my thoughts.

youdao

So a hundred years really before the invention of Game Theory, someone had figured out this answer for this game.

一百多年前博弈论还没有诞生呢,那时就有人解除了这个博弈的答案

耶鲁公开课 - 博弈论课程节选

I was probably, I think, sixteen when I went, so this was several, several years ago.

那时我才十六岁，那是几年前的事了。

大都会艺术博物馆 - SpeakingMax英语口语达人