I suppose the first apparently historical event that we know something about is the first Olympic Games, which according to Greek tradition were held in 776 B.C.

我认为第一个已知的重大历史事件,就是第一次奥林匹克运动会,根据希腊人的口头传述,那是发生在公元前七百七十六年

耶鲁公开课 - 古希腊历史简介课程节选

That held for about thirty seconds, that tonic chord.

这样大概经过了30秒的样子，就是那个主音和弦。

耶鲁公开课 - 聆听音乐课程节选

It makes a lot of sense when we look at it energetically, because if we think about a 1 s core electron, that's going to be held really, really tightly to the nucleus.

从能量的观点来看这是非常合理的，因为如果我们考虑一下，1，s，芯电子，它会被原子核束缚得非常非常紧。

麻省理工公开课 - 化学原理课程节选