They start as what are called vesicular lesions, or like blisters, where they're filled with a fluid.

这往往以出水痘开始,或者起水疱,里面充满液体

耶鲁公开课 - 生物医学工程探索课程节选

These are very deep lesions that go not just on the surface of your skin like a blister would, but down into the dermis or deeper layers of the skins, as well.

这些伤非常深,它们不仅像水泡那样存在于皮肤表面,还深入到真皮层或者皮下更深的地方

耶鲁公开课 - 生物医学工程探索课程节选

So these are just some pictures to show you what the smallpox lesions look like on the face of a child, and then distributed over the whole body of an adult, to give you some better idea of what kind of a disease this was.

所以这里给你们展示一些图片,这就是小孩脸上的天花伤痕,这是天花遍布成人全身的样子,它能让你们更好的理解,天花是一种什么样的疾病

耶鲁公开课 - 生物医学工程探索课程节选