The best way to measure how much you've grown isn't by inches or the number of laps you can now run around the track, or even your grade point average - though those things are important, to be sure.It's what you've done with your time, how you've chosen to spend your days, and whom you've touched this year. That, to me, is the greatest measure of success.

长期而言，最严酷的大规模杀伤性武器是愚蠢。

过去从未死去，它甚至从未过去。

以耗尽地球为代价的利润根本不是利润。

States are rational actors that seek to maximize their power and security in an anarchic international system.