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》

They're also a good source of both magnesium and potassium.

它们也是镁和钾重要来源。

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In whole plants, sodium is scarce and potassium is plentiful.

在绿色植物中，钠的含量较少，而钾的含量相对丰富。

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It can also interact with other medications, especially certain types of cardiovascular medications such as ACE inhibitors,receptor blockers and potassium-sparing diuretics."

VOA: special.2011.03.30

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

耶鲁公开课 - 生物医学工程探索课程节选

They're typically made of a metallic weave that can include carbon, lead and potassium.

FORBES: Shield sham

Typically they are made of a metallic weave that can include carbon, lead and potassium.

FORBES: Shield Sham

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

FORBES: Death from Dehydration