"First of all,it's good that disagreements are taking place in parliament,".

VOA: standard.2009.10.26

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

Usually it's done by taking all or part of the infectious agent, and showing them to your immune system in some way.

通常它会带着全部或部分抗原介质,并以某种方式呈递给你的免疫系统

耶鲁公开课 - 生物医学工程探索课程节选