尊敬的各位老师，亲爱的同学们，大家上午好： 

　　每次参加毕业典礼，我都不太喜欢发言这个环节，哈哈。所以，今天我就言简意赅的说三个关键词，快速结束我的毕业感言，机智如我。 

　　第一个关键词：时光 

　　时光漫长又不长。每次看2017年冯小刚拍的电影——《芳华》，我都有不同的感受。而回到自己身上，或许就是自己在读博期间，我们在纳米中心的这几年的科研生活。冯小刚的电影纪念的是他在文工团的青春，而在中心的这三、五年，又何尝不是我们在以后所怀念的芳华。2013年的那个夏天，我第一次来到纳米中心；2019年的这个夏天，我即将博士毕业，告别这个我们整整生活了五年的地方。从2014年第一次参加课题组陈闽江师姐的毕业典礼算起，前后五次毕业典礼，我一次都没有缺席。第六次，轮到我自己博士毕业了! 

　　这段时光，好慢啊。这段“煎熬”的时光里，曾经烧过炉子的原子楼拆掉都快建好了，五道口的铁道轨已经没了，青年公寓旁边的清华园地铁站倒闭了，半夜也再听不到哄哄的火车声，地铁票也从刚开始的二元随便坐变成了按里程计价了。这五年里，在中心招生活动中，曾经带过四批的夏令营同学。如今我带过的王诗哲和冷玄烨两位师弟，今天也和我一起都毕业了。也还清楚记得，有一年冬天我和张晓锐博士在寒风中等了快俩小时买五道口枣糕，而两年前它也倒闭迁移地址了。前几天，和文雯博士吃完饭后边走边聊。她说：念念，你从一个精致的小伙儿，怎么变成现在这样不修边幅的糙老男人了（粗糙的“糙”）。这就是岁月带给我们的改变吧。 

　　这段时光，又是如此的短暂啊。因为，我们不想毕业，因为毕业后我们再也不能称之为“学生”了。我喜欢和怀念我们即刻便将逝去的“学生”生涯。不舍这五年的科研生活和这里的点点滴滴。我知道人世间必将一遇分离，因此会在心底藏住这段宝贵的记忆。 

　　第二个关键词：感谢 

　　感谢我们的导师。在这五年里，或许会有对我们的苛刻，但是工作中他们心里总是有对我们的牵挂；感谢研究生部的老师。他们从招录我们进入纳米中心的大门到送走我们成功毕业，付出了很多。这五年，让我自豪的是，每次和其他研究所的学生进行交流，我深刻感受到，纳米中心是一个有“温度”的地方。丰富的文化生活，例如品咖啡、品红酒，让我们枯燥的生活有了一丝光亮；感谢中心的领导，在我博士第四年涨了工资，哈哈；感谢我身边的同学，我们一起在纳米中心，度过了这五年的科研时光。 

　　第三个关键词：反哺 

　　今天的关键词是“毕业”，主角是身着学位服的我们。此刻，我们是舞台上的“台柱子”，而他日或许便天涯各一方了。但是，不管去往哪里，我想从此我们都有同样身份——Nano校友了。经常听到一句话叫做：聚是一团火，散作满天星。我希望，不管走向哪里，如果我们再次遇见，都能扶持互助。如果，哪一天，我们有实力、有能力了，也会第一刻便想到纳米中心曾经对我们的培养吧。用自己的行动来维护纳米中心的形象，在纳米中心或中心校友需要的时候能伸出援手。对于自己，我们能“勇敢自信、健康体魄、热爱工作、用心生活”；对于家人，我们能好好照顾好他们；对于社会，我们能在自己所在的平凡岗位上做一个螺丝钉，贡献、服务于国家和人民，发挥自己的价值……这些简单的行动，或许就是在以后的日子里，我们毕业生对中心最好的“反哺”。 

　　结语 

　　不好意思，我竟然说多了。最后一个part是送给在座的朋友们的祝福： 

　　但愿你的眼睛只看得到笑容 

　　但愿你流下每一滴泪 

　　都让人感动 

　　但愿你以后每一个梦 

　　不会一场空 

　　最后愿你，永远自在如风，轻描时光漫长。 

　　2019年6月26日 

　　于北京市中关村北一条11号 

　　Dear teachers and friends, good morning : 

　　Every time I attend the graduation ceremony, I don’t really like this part, haha. Therefore, I am just concisely speaking three key words, and will end my speech quickly. 

　　First keyword: time 

　　Time is long and is also not long. Every time I watch the film which took by Feng Xiaogang in 2017, called “Fanghua”, and I have different feelings. Feng Xiaogang’s film commemorates his youth in the art troupe, and the three or five years in the center is our “Fanghua”. In the summer of 2013, I first came to the NCNST. In the summer of 2019, I will graduate and will leave from the place where we have lived for five years. Since I attended the graduation ceremony for the first time in 2014, I did not absent at the graduation ceremony for five times. It is the sixth time until now and it is my turn to graduate! 

　　The time is so slow somehow. During this period of time, the atomic building that once burned has quickly built, and the railway track of Wudaokou was gone. The Tsinghua Park subway station next to the youth apartment closed down and the sound of the train could not be heard in the midnight anymore. In the pastime, I have brought four batches of summer camp students in the center's enrollment activities. I also clearly remember that one winter, Dr. Zhang Xiaorui and I were in the cold wind for two hours to buy Wudaokou jujube cake, and two years ago it also closed down. A few days ago, Dr. Wen Wen walked and talked with after the dinner. She said: I find that you have changed from a hansom boy to such a rough old man who is not trimmed. This is the change that the time bring to us. 

　　The time is so short somehow. Because we don't want to graduate, because after graduation we can no longer be called as “student”. I know that we will separate, so this precious memory will be hidden in my heart. 

　　Second keyword: thanks 

　　Thanks to our mentor. In the past five years, there may be harshness for us, but they always concern about us. Thanks to the teachers in NCNST. They have paid a lot from recruiting us to NCNST to helping us to graduate successfully. I am proud when I interact with students from other institutes, I deeply feel that the NCNST is a place with “warm temperature”. Rich cultural life, such as coffee and red wine, bring us a glimmer of light in our boring life. Thanks to the leadership of the center, they raised my salary in the fourth year of my doctor. Thank to my classmates, we are together for five years. 

　　Third keyword: back feeding 

　　Today, the key word is “graduation” and the protagonist are us in the degree suit. At this moment, we are the “pillars” on the stage, but we may be on the other side of the world tomorrow. However, no matter where we go, I think we all have the same identity - Nano alumni. I hope that no matter where we go, if we meet again, we can support each other. If we have strength and ability someday, we will think of the nano center once cultivated us. Use your own actions to maintain the image of the NCNST, and lend a helping hand when the NCNST or our alumni need it. These simple actions may be the best "backfeeding" of ours in the future. 

　　Conclusion 

　　Sorry, I actually said more. The last part is a blessing to all of you: 

　　I hope your eyes only see the smile 

　　I hope that every dream in the future 

　　Not going to be empty 

　　2019.6.26