来自《耶鲁大学开放课程：1600年后西方社会的流行病第6集第6集》

Plague was transmitted by vectors.

瘟疫是通过携带者传播
You know the drill now, the role of rats and fleas.

你们知道老鼠和跳蚤在传播中的作用
Smallpox instead is spread by contact and

而天花则是通过接触
airborne inhalation of droplets.

和空气吸入颗粒传播
Plague is a classic epidemic disease,

瘟疫是一个经典的流行病
in the sense that it's an outside invader that

这是因为有一个外在的侵略者
ravages a locality for

在某个季节侵扰
a season and then departs.

当地人然后离开
Smallpox is different in that

天花不同于瘟疫
it can be both endemic and epidemic.

它既可以是地方性的也可以是流行性的
So, we'll see a different dynamic.

所以我们将看到不同的动态
It's also true that the social responses

还有一个事实是