Good morning, esteemed faculty and families of my fellow graduates . It's an honor to be standing up here today. I know we all think that we're immortal不朽的, we're supposed to feel that way, we're gruduating, but, like our brief four years in high school, what makes life valuable is that it doesn't last forever, what makes it precious is that it ends . And i know that now more than ever .And i say it, today of all days, to remind us that time is luck, so don't waste it leavimg someone else's life, make yours count for something , fight for what matters to you, no matter what, because even if we fall short, what better way is there to live?