But variola, which causes smallpox in humans, and vaccinia, which causes a disease called cowpox in cattle, turned out to be, we now know, viruses that are molecularly very similar.

但是导致天花的人痘病毒,和导致牛痘,的牛痘病毒,后来发现其实是,我们现在知道,这两种病毒在分子水平上十分相似

耶鲁公开课 - 生物医学工程探索课程节选

And just went out runs together, and it turned out we were from sort of the same region of the States.

我们一起去跑步，后来发现其实我们是来自同一个地区。

在马拉松认识的朋友 - SpeakingMax英语口语达人