Atoms of different elements combine in simple whole number ratios to form compounds.

不同元素的原子,以简单的整数比化合成化合物。

麻省理工公开课 - 固态化学导论课程节选

He both replaces and yet reconfigures according to his own lights, elements from both the Christian empire and the Roman republic, to create a new form of political organization distinctly his own.

他不但取代还重新配置,且是根据他自己的想法，原理,有别于基督帝国与罗马共和，创造出一种新型的政治组织,独树一帜。

耶鲁公开课 - 政治哲学导论课程节选

So if we consider lithium, potassium, and sodium, they're all together in the same group on the periodic table, knowing what we do about biology we can immediately think of sodium and potassium, or even just knowing what you know about table salt, for example, that these are two elements that we find, and particularly in the ion form in very high concentrations in our body.

我们来考虑一下锂，钾和钠，它们都在周期表中的同一族里，想要知道我们将元素周期律,用到生物学会怎么样，我们首先想到的就是钠和钾，甚至只需要知道食盐，我们发现它们是以很高浓度的离子形式,存在于我们体内的两种元素。

麻省理工公开课 - 化学原理课程节选

Now if you read in the book, you read about where this figure is shown in the book, you can understand more about why these structures line up in the right way so that the right molecular elements are together to form hydrogen bonding pairs between them.

如果你预习过课本,课本中有关于这些详细的描述,你可以更深刻的理解,为什么这些结构是采用这种连接方式,以使对应的分子部分靠近,并形成氢键连接

耶鲁公开课 - 生物医学工程探索课程节选