.. So, why didn't somebody think of-- you're sitting there with your child playing with a wheeled toy and then you're going out to carry some heavy stuff and you're dragging it along the ground.

因此，为什么有人想不到-,当你和玩着玩具车的小孩,坐在一起,然后你出去,拿一些很沉的东西,你却是生拉硬拽地把它放在地上拖过来。

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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