The greatest thing in life is to keep your mind young.
人生中最伟大的事情就是保持心态年轻。
Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. And not to Democrats alone do I make this appeal, but to all who love these great and true principles.
The future of drones is not to replace humans, but to empower them.
量子世界和经典世界之间的边界不是一条清晰的线，而是一个模糊的过渡，物理规则在这里发生了戏剧性的变化。
In times of uncertainty, clarity of purpose becomes even more critical.