保持健康，不要失去勇气。
keep fit and don't lose your nerve.
In mathematics, the simplest questions often lead to the most profound discoveries.
在危机时刻，真正的领导者通过保持冷静、专注和果断而脱颖而出。
The future of chemistry lies in making the complex simple.
La peur est souvent la cause de nos plus grands malheurs.