To lead is to serve, not to command.

The true discovery of America is before us. The true fulfillment of our spirit, of our people, of our mighty and immortal land, is yet to come.

舞台是我感觉最有活力的地方。

埃尔德什差异问题让我着迷，因为它陈述起来如此简单，但含义却如此深刻。