What's shown in this diagram is the progress of the developing embryo as it travels in time, down the fallopian tube.

这张图上显示的,就是胚胎发育的过程,是按照它在输卵管中移动的时间排序的

耶鲁公开课 - 生物医学工程探索课程节选

And unfortunately, in order to get those stem cells, that requires killing the embryo.

而不幸的是，要想得到这些干细胞，就需要杀死胚胎。

干细胞和伦理 - SpeakingMax英语口语达人

They're controversial, I think for obvious reasons, because you have to sacrifice an embryo in order to get them.

这些研究极富争议,我想原因很明显,因为你必须牺牲一个胚胎来取得干细胞

耶鲁公开课 - 生物医学工程探索课程节选

There's a change in sort of the shape of the overall embryo as well.

与此同时,胚胎的外形,也有一定程度的变化

耶鲁公开课 - 生物医学工程探索课程节选