Let's take salt, solid, and dissolve it in a bunch of liquid water.

我们把食盐晶体，溶解在一些水中。

麻省理工公开课 - 热力学与动力学课程节选

Similarly, we find it in table salt, we're taking it in all the time, the same with potassium, think of bananas, were always eating potassium.

同样地，我们发现食盐中含有钠，而我们一直在吃盐，钾也一样，想一想香蕉吧，吃香蕉也就是在吃钾。

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