The term structure is one of the most interesting things in economics because it shows the price of time at various maturities.

经济学中,期限结构是个有趣的话题,因为它揭示了不同到期期限的时间价值

耶鲁公开课 - 金融市场课程节选

Most of the time, it's not at gunpoint.

大多时候，并不是被枪指着劫持的。

大城市是否危险？ - SpeakingMax英语口语达人

But smallpox was, at one time, one of the most frightening diseases on the planet.

但是天花曾经,是这个星球上最令人恐惧的疾病之一

耶鲁公开课 - 生物医学工程探索课程节选

For example, in terms of the atomic theory of matter, at the time at the turn of the Century, the understanding was that atoms were the most basic constituent of matter, meaning you couldn't break atoms up into anything smaller - that was it, you're done.

例如在原子理论中,在19，20世纪之交的时候,人们认为原子是,组成物质的最基本粒子,也就是说你不能,把原子再分割了,就这样了。

麻省理工公开课 - 化学原理课程节选