Some foreign policy experts in South Korea think the sanctions have forced Pyongyang to consider coming back to the negotiating table.

VOA: standard.2009.12.08

So specifically, what we're asking here is as we go across the periodic table, we want to consider which has the smaller ionization energy.

具体地说，我们这里要问的是,从周期表来看，你认为,哪一个元素的电离能更低。

麻省理工公开课 - 化学原理课程节选

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