People think that once you get infected one time you develop immunity for the rest of your life.

VOA: special.2011.04.20

Callicles tells Socrates "Philosophy is a pretty toy if one indulges in it with moderation at the right time of life.

他告诉苏格拉底,如果一个人在年轻时代,有节制地享受哲学的乐趣，那自然大有裨益。

耶鲁公开课 - 公正课程节选

but in that time, I'm hoping to set up my life such that one day, in the long term,

但长期以来，我希望有一天能够掌握自己的生活，

事业和人生都重要 - SpeakingMax英语口语达人

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