this is one of the

你就会知道这是免疫学中
most important and rapidly evolving areas of the study of immunology.

最为重要而且高速发展的一个研究领域
In fact, the people who have been most important in understanding

事实上在研究先天免疫系统
how the innate immune system works are people here at Yale.

反应机理中最重要的科学家就在耶鲁
The immune system that we're used

我们过去认识的免疫系统部分
to thinking about is called the adaptive immune system,

现在被称为获得性免疫系统
and the adaptive immune system does just that.

获得性免疫系统功能如下
It changes or adapts

它通过改变自身
in response to an insult or a threat.

以获得抗性来应对侵犯和威胁
So, this is the kind of immune response

所以这是一种在需要时
that gets activated only when it's needed.

被激活的免疫反应
Then it will stay activated for some period of time,

它在某一时间段保持激活状态