Because it's important not to confuse them,

将它们区别开来是非常重要的
because each has its own history.

因为每一个疾病都有自己的一段历史
And a crucial variable is the differing way

一个区别它们重要因素是
in which each of these diseases affected its victims.

这些疾病是如何影响受害者的
And a feature of the plague, I would argue,

我认为瘟疫的一个特征是它似乎
is that it seemed almost purposefully designed to maximize terror.

特意被设计成拥有使恐怖最大化的能力
I will be showing you some vivid material,

我要给你们展示几个生动的材料
and I'm sorry that it's just before lunch.

很抱歉这堂课正好在午饭前
And indeed a couple of years ago in this class

几年以前在这门课上确实有一位
someone in the front row fainted with some of the pictures.

坐在前排的同学在看到这些图片时晕倒了
So, if you don't wish to look at them,

如果你们不希望看到这些图片
I can tell you in advance it's not compulsory.

事先声明这些图片不是你们必须要看的