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

in the last couple lectures at a really important topic in thermodynamics.

在前面几次课里,面我们考察了热力学中一个很重要的课题。

麻省理工公开课 - 热力学与动力学课程节选