Calcium reacts with water but less violently than sodium and potassium do.

钙能与水产生化学反应但不如钠以及钾那么剧烈。

《柯林斯英汉双解大词典》

Sodium and potassium are about the same in their chemical properties.

钠和钾的化学性质几乎是相同的。

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And after 15 years, people with the better balance of sodium and potassium were more likely to still be alive.

而钠钾盐摄入平衡的人群，在15年后的存活率高于摄入不平衡的人群。

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if we're actually thinking about electron configuration and we look at lithium, sodium and potassium, these all have one valence electron.

让我们来想一想,锂，钠，钾的电子排布，它们都只有一个价电子。

麻省理工公开课 - 化学原理课程节选

That potential difference is generated by the movement of ions, principally sodium and potassium across the membrane.

电势差是由离子运动造成的,特别是钠和钾的跨膜运动

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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

Too little or too much electrolytes like sodium and potassium in the body can cause trouble.

FORBES: Death from Dehydration

As mentioned, Jake has much higher amounts of alkali elements, metals such as sodium and potassium, than previously analysed Martian rocks.

BBC: Cosmic coincidence on the road to Glenelg

Nerve cells transmit their signals using electrically charged atoms (called ions) of sodium and potassium, which work rather like electrons in a metal wire.

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