Protein is one of our most important dietary requirements, and evidence shows that lack of essential amino acids, 蛋白质是我们最重要的日常所需，有证据显示，若孩童饮食中缺乏氨基酸， the building blocks of proteins, in young children's
THE PRESIDENT: Thank you, General, for your kind and short introduction. (Laughter.) I am pleased to be back at the National Defense University again. It turns out this is my fifth visit as President.
You graduates came to Harvard at a different time. You know more about the world's inequities than the classes that came before. In your years here, I hope you've had a chance to think about h
