求翻译：As Secretary of State, I am well aware of the challenges that we face. You, as new graduates, and your generation will be up against those challenges: climate change and hunger, extreme poverty and extreme ideologies, new diseases and nuclear proliferation. But I am absolutely convinced that you and we are up to the task. There is no problem we face here in America or around the world that will not yield to human effort, to cooperation, to positive interdependence that makes clear humanity is going on, our challenges are ones that summon the best of us, and we will make the world better tomorrow than it is today. (Applause.)是什么意思？

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