So a vaccine is designed in order to engage that biology,

所以疫苗的作用就是参与这个生理活动
in order to provide antigens that will stimulate specifically your immune system.

提供抗原来刺激你的免疫系统
Usually it involves pieces of the infectious agent itself,

通常疫苗自身也包含部分传染性介质
to cause that engagement.

以便达成匹配
So, that's what a vaccine is,

这就是疫苗
and vaccination is the process of taking that vaccine

接种疫苗的过程就是生产疫苗
that you've developed and giving it to people,

并把它分发给大众
either individual people or groups of people,

不论是给个人还是给群体
or as we'll talk about today,

或者就像我们今天所说的
people all over the world.

给全世界的人民
And so that's a very different thing, right?

而这是完全不同的对吗
Designing something that works in a particular individual,

设计在特定个体身上生效的东西