居身平安之境要考虑危难之时，处身太平盛世要想到乱世之日。

Sometimes the simplest questions lead to the deepest theories.

Every smell we perceive is a complex interaction between molecules and receptors, and understanding this interaction is key to understanding our sensory experiences.

因此，我决定只阅读那些被处决过或以某种方式冒过生命危险的人的著作。