In fact, of all the systems of cellular differentiation that are known in our bodies, probably hematopoiesis is the best known.

事实上,我们体内已知的,所有由细胞分化成的系统中,造血系统也许是最为人所熟知的

耶鲁公开课 - 生物医学工程探索课程节选

It was the first place where the concept of stem cells was developed, in that if one looks carefully one can find immature cells in the bone marrow.

这是干细胞概念的发祥地,如果仔细观察造血系统,就能找到骨髓中的未成熟细胞

耶鲁公开课 - 生物医学工程探索课程节选

In the matopoetic system it's the most well known.

在造血系统中这种困难尤为出名

耶鲁公开课 - 生物医学工程探索课程节选