So if you think of the effect of technology on the different populations, the young-age and the adult-age learners.

所以在思考技术对,不同人群的影响时，要想到青年和成年学者。

麻省理工公开课 - 媒体、教育、市场课程节选

You know probably that within your bone marrows there's populations of cells, there are different kinds of cells within the bone marrow.

你也许知道的,在你的骨髓里,有许多种细胞,骨髓中有不同种类的细胞

耶鲁公开课 - 生物医学工程探索课程节选