Suppose we don't know what economic circumstances we'd be born into and what kind of contingencies we'd have in life.

假设我们不知道,将会在怎样的经济环境中生存,而生命中又会有怎样的意外发生。

耶鲁公开课 - 金融市场课程节选

In order for life to proceed, you need to maintain a constant internal environment.

为了维持生命,人体的内环境需要保持稳定

耶鲁公开课 - 生物医学工程探索课程节选