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