And they wanted to use a soluble salt of citric acid, so they could have used sodium, they could have used potassium.

而且他们想用一种柠檬酸的可溶性盐，他们本可以用钠，也可以用钾。

麻省理工公开课 - 化学原理课程节选

The ones that get talked about the most in terms of health, the one is sodium of course, because salt intake but the others are important for health as well and in some cases they're being consumed in large amounts and some in small amounts.

提到最多的和健康相关的矿物质,当然就是钠了,因为人每天都吃盐,但其它元素对健康也同样重要,某些情况下,矿物质的消耗量会很大,而在另一些情况下则很小

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

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