Leadership means making tough decisions today that will pay off decades from now.

"A story is a way to say something that cannot be said any other way."

真正的美国发现还在我们面前。我们精神、我们人民、我们强大而不朽的土地的真正实现尚未到来。

引力波的探测为我们打开了一扇观察宇宙的新窗口。

没钱不要到人前去，遭难就别去寻亲探友。