That's just the simple sequential sense of "first," the first that comes before second, third and fourth; but there's something more radical here than the ordinal or sequential sense of "first."

这只是“先“表示顺序的简单含义,先于第二，第三，第四的那个“先“，但这里,“先“除了表示顺序的意思外还有更激进的含义“

耶鲁公开课 - 弥尔顿课程节选

There's London School of Economics, which is, I think like the third or fourth best.

有伦敦政治经济学院，它是排名第三还是第四。

英国的高考 - SpeakingMax英语口语达人

s1 So for the fourth period, now we're into the 4 s 1 3d for potassium here. And what we notice when we get to the third element in 4s2 and the fourth period is 3d that we go 4 s 2 and then we're back to the 3 d's.

对于第四周期到现在我们来到钾的1,然后我们返回到,我们注意到当我们看到第三个元素,第四周期我们来到,然后我们返回到。

麻省理工公开课 - 化学原理课程节选

Then you get successively deeper, II through IV, slow, irregular, high amplitude delta waves, and then once you reach stage IV you start going up again, up through stage III and II.

然后睡得越来越深，从第二到第四阶段，慢，不规则，高振幅的δ波，等你到达第四阶段，你又开始返回，第三阶段和第二阶段。

耶鲁公开课 - 心理学导论课程节选

French horn, yeah,but notice that if we take this aggregate-- and we're back to that same idea of the octave,the fifth,the fourth and the third, sort of,so it's again sort of primordial, this particular acoustical basis of so much of music.

法国号，对，但是注意，从总体的角度来看-,我们又回到了八度的概念，第五，第四，第三，大概是这样，所以这依然是是很基础的形式，许许多多音乐都是以这一种形式为声学基础的。

耶鲁公开课 - 聆听音乐课程节选

so it's gonna have some impact on the third quarter, maybe leaking in the fourth quarter Um, I haven't looked at the details I might not get a check If I did, I just take in the check and go and say that we wouldn't spend it.

该计划产生的影响,或许要到第三季度才有所体现，当然也许会蔓延至第四季度,嗯，我个人也还没有深入研究,我也许并会去领支票,即使领了，我也只是拿到后离开,然后说，我们才不会花掉呢。

斯坦福公开课 - 经济学课程节选

s But it just turns out that the 4 s is so low in energy that it actually surpasses the 3 d, because we know the 3 d is going to be pretty high in terms of the three shell, and the 4 s is going to be the lowest interms of the 4 shell, and it turns out that we need to fill up the 4 s 4s before we fill in the 3 d.

但是结果是,能量较低,4s是第四层最低的，因为我们知道3d在第三层,是非常高的，4s是第四层,最低的，结果是我们在填充3d之前,需要先填充。

麻省理工公开课 - 化学原理课程节选