这些都发生在，20世纪早期的英国。

Both of these were in the UK in the early part of the 20th century.

youdao

注意，这些都发生在70年代。

Note, all this took place in the 70's.

youdao

毕竟，这些都发生了。

It has, after all, happened before.

youdao

What's happening there? Well, the selection of reactants has been done judiciously to provide either heat or to provide something that's cool.

就会感到这东西，比如说变冷了，对吧？,这里发生了什么？这些反应物都是,被仔细的选出来的，能够提供热量或制冷。

麻省理工公开课 - 热力学与动力学课程节选

Milton wants to create the illusion that he's predicting, or that he's prophesying, the actions recounted in the poem, as if Milton were prophesying what of course we know to be already past.

弥尔顿想给我们一种他在预言，诗中所叙之事的感觉，似乎他是在预言这些我们都知道已经发生了的事情。

耶鲁公开课 - 弥尔顿课程节选

And you can imagine this gets complex and there's lots of interesting things to do to look to the real form, but those are the things that you should see.

可以想象下这样下去问题会变的复杂起来,而且当面对真实情况的时候,会有很多有趣的事情发生，但是这些东西你都应该明白的。

麻省理工公开课 - 计算机科学及编程导论课程节选