You have been an excellent elder sister. Even though you two had your share of fights, the last few years you have become best friends. Your sister loves you so much, and she loves to make you laugh. She looks up to you, and sees you as her role model. As you saw when we departed, she misses you so much. And I know that you miss her just as much. There is nothing like family, and other than your parents, your sister is the one person who you can trust and confide in. She will be the one to take care of you, and the one you must take care of. There is nothing we wish more than that your sisterhood will continue to bond as you grow older, and that you will take care of each other throughout your lives. For the next four years, do have a short video chat with her every few days, and do email her when you have a chance.

你也是个很好的姐姐。虽然你们姐妹以前也会打架，但是长大后，你们真的成为了好朋友。妹妹很爱你，很喜欢逗你笑，她把你当成她的榜样看待。我们开车离开哥大后，她非常想你，我知道你也很想她。世界上最宝贵的就是家人。和父母一样，妹妹就是你最可以信任的人。随着年龄的增长，你们姐妹之间的情谊不变，你们互相照应，彼此关心，这就是我最希望见到的事情了。在你的大学四年，有空时你一定要常常跟妹妹视频聊聊天，写写电子邮件。

College will be the most important years in your life. It is in college that you will truly discover what learning is about. You often question "what good is this course". I encourage you to be inquisitive, but I also want to tell you: "Education is what you have left after all that is taught is forgotten." What I mean by that is the materials taught isn't as important as you gaining the ability to learn a new subject, and the ability to analyze a new problem. That is really what learning in college is about – this will be the period where you go from teacher-taught to master-inspired, after which you must become self-learner. So do take each subject seriously, and even if what you learn isn't critical for your life, the skills of learning will be something you cherish forever.

大学将是你人生最重要的时光，在大学里你会发现学习的真谛。你以前经常会问到 “这个课程有什么用”，这是个好问题，但是我希望你理解：“教育的真谛就是当你忘记一切所学到的东西之后所剩下的东西。”我的意思是，最重要的不是你学到的具体的知识，而是你学习新事物和解决新问题的能力。这才是大学学习的真正意义——这将是你从被动学习转向自主学习的阶段，之后你会变成一个很好的自学者。所以，即便你所学的不是生活里所急需的，也要认真看待大学里的每一门功课，就算学习的技能你会忘记，学习的能力是你将受用终身的。

Do not fall into the trap of dogma. There is no single simple answer to any question. Remember during your high school debate class, I always asked you to take on the side that you don't believe in? I did that for a reason -- things rarely "black and white", and there are always many ways to look at a problem. You will become a better problem solver if you recognized that. This is called "critical thinking", and it is the most important thinking skill you need for your life. This also means you need to become tolerant and supportive of others. I will always remember when I went to my Ph.D. advisor and proposed a new thesis topic. He said "I don't agree with you, but I'll support you." After the years, I have learned this isn't just flexibility, it is encouragement of critical thinking, and an empowering style of leadersh

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