Cells can stop in their lifetime at some point in the cell cycle and persist for long periods of time.

细胞生命期可以停止在细胞周期的某个点,并保持很长时间

耶鲁公开课 - 生物医学工程探索课程节选

No one of us can get out of the space and time of life.

谁也不能逃脱生命的空间和时间。

普林斯顿公开课 - 人性课程节选

And for some people the balance is positive, " for some people perhaps the balance is negative, " whether for their life as a whole " or for certain stretches of their lives."

对某些人，结果是正数，“对某些人结果是负数，“不管是他们的一生,“或者他们生命的一段时间“

耶鲁公开课 - 死亡课程节选

They are RNA molecules but they have at some points in their life span, they have amino acids attached to them.

这些是如假包换的RNA分子,但在其生命周期的特定时间,它们会携带一个氨基酸分子

耶鲁公开课 - 生物医学工程探索课程节选