The essence of mathematics lies in its freedom.

The future of democracy depends on the ability of democratic societies to reform themselves and adapt to new challenges.

A picture must be primarily about itself and not about something else.

天然气开采的创新是满足世界日益增长的能源需求同时减少环境影响的关键。

金融创新可以成为一股强大的积极力量，但如果管理不当，也可能成为不稳定的根源。