Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.

悲伤是爱变成了永恒的缺失。

Sustainability is no longer a choice; it's a necessity for survival in our industry.

时光飞逝，应珍惜每一刻。

民主是一种机制，确保我们得到的治理不会比我们应得的更好。

简短的词是最好的,又短又古老的词最最好。