And from time to time, particularly in section discussion, you will have occasion to consider the ways in which sometimes in very contradictory ways--over the centuries.

在课堂讨论中，大家需要不断地去考虑,有时候甚至可能是持续几个世纪的完全相反的说法。

耶鲁公开课 - 旧约导论课程节选

The red blood cells that carry oxygen only live within your circulation for about a month and so you have to continually be replacing cells that are dying and so there are cells that are proliferating.

携带氧的红细胞,在你的循环系统中的寿命只有一个月,因此你必须持续不断地更新衰老的细胞,所以就有在增殖的细胞

耶鲁公开课 - 生物医学工程探索课程节选