Many people take aspirin to reduce the risk of a heart attack or stroke from blood clots.

VOA: special.2009.10.20

So if you have a bad heart, then a scientist can take like, cells from your leg,

所以，如果你心脏不好，科学家就可以从你的腿上提取干细胞，

关于干细胞的研究 - SpeakingMax英语口语达人