All of the poets we read, even that New England hayseed, Robert Frost, begin their careers in metropolitan centers, primarily in London and New York.

我们阅读过的所有诗人，包括新英格兰的乡巴佬弗罗斯特，在大都会的中心开始了他们的职业生涯，首要的是伦敦和纽约。

耶鲁公开课 - 现代诗歌课程节选

And so now what I want to do is start here at the center.

于是现在,我想要从中心开始。

麻省理工公开课 - 固态化学导论课程节选

Even the characteristic thing in a polis, the agora, the marketplace,which also becomes the civic center of these towns, even these grew up later than the polis.

即使像"市",就是集市,这样城邦的标志性建筑,和城邦的中心建筑,也是在城邦建立之后才开始发端的

耶鲁公开课 - 古希腊历史简介课程节选

Often a good thing to start with is to put the lowest ionization energy atom in the middle, and if you don't have charge separation then go with that structure, but if you do find you have a lot of separation, such as the case in negative 2, positive 2, and minus 1, then you want to say wait a second, this is really bad in terms of formal charge, let me go ahead and see what other options I have here.

通常一开始把电离能最低的原子,放在中心位置就很好了，如果你发现电荷没有分开,那么这个结构就没问题了，但是如果你发现有很多分开的电荷，比如这种情况，有负二，正二和负一，那么你会想要说等一下，从形式电荷来看这很不好，让我去看看其它可能的选择。

麻省理工公开课 - 化学原理课程节选

This is the separation measured from the center of the sodium nucleus.

这就是分离,从钠核中心开始算。

麻省理工公开课 - 固态化学导论课程节选