数学研究是具体与抽象之间不断的对话。
The study of mathematics is a constant dialogue between the concrete and the abstract.
过去从未消逝，它甚至从未过去。
La vida es una tragicomedia que se representa en un escenario inestable.
Leadership is about making tough decisions today that will benefit future generations.
Sustainability is not just about protecting the environment, it's about creating a system that works for everyone.
One should forgive one's enemies, but not before they are hanged.
Every poem is a love poem.