As we've found cells from adult organisms that seem to be multipotential and studied them more carefully, some of their potentials turn out to be lost, they're not exactly the same.

因为我们在成人机体中找到,这些看上去是多能干细胞的细胞后,仔细研究后发现它们的一些潜能已经丢失,和胚胎中的那些并不一样

耶鲁公开课 - 生物医学工程探索课程节选

stem cell research can go on without the ethical dilemma provided by killing embryos.

干细胞研究者可以免受由于杀死胚胎而带来的道德困境。

干细胞和伦理 - SpeakingMax英语口语达人