Having reached the penalty shootout after a hectic extra period, the Ghanaians again looked lost when they missed their third and fourth attempts from the spot.

VOA: standard.2009.10.17

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

Now we can think about the fourth period, and the fourth period is where we start to run into some exceptions, so this is where things get a teeny bit more complicated, but you just need to remember the exceptions and then you should be OK, no matter what you're asked to write.

现在我们可以考虑第四周期，而且在第四周期,我们会遇上一些特例，所以事情有,一点复杂，但是你只需要记住,这些特例然后就没有问题了，无论你被要求写什么。

麻省理工公开课 - 化学原理课程节选

Then on the other hand, at the other extreme, you have scholars who see the patriarchal stories as entirely fabricated retrojections of a much later age. And they vary significantly as to when they think these stories were written: anywhere from the period of the monarchy all the way down to the fourth century, some of them.

另一方面又是另一个极端，有学者认为族长故事完全是后世编造的,这样一来，对这些故事是什么时候写的,也有巨大的分歧：,其中一些人认为是在从君主制时期,到公元4世纪之间的某段时候。

耶鲁公开课 - 旧约导论课程节选