This is one of the very important areas that still is not completely understood in stem cell biology.

这是一个干细胞生物学领域的重要课题,至今仍未完全明确

耶鲁公开课 - 生物医学工程探索课程节选

That's a lot of what stem cell biology is like - is about.

干细胞生物学的著作有很多

耶鲁公开课 - 生物医学工程探索课程节选

There's nothing in biology per se that rules out cell division.

生物学中没有排除细胞分裂的铁规则。

耶鲁公开课 - 死亡课程节选