求翻译：在2011年4月24日清华大学举行了百年校庆，海内外数万名毕业生、著名科学家杨振宁等参加了校庆活动，会上胡锦涛主席发表了演讲，激励所有的老师和同学为了他们的梦想和国家的未来而努力。是什么意思？

In the April 24, 2011, Tsinghua University held a centennial celebration, tens of thousands of graduates at home and abroad, the famous scientist Yang attended the celebration event, at which President Hu Jintao delivered a speech, encouraging all the teachers and students to their dreams and countr

正在翻译，请等待...

Qinghua University has held hundred years school anniversary in April 24, 2011, everywhere tens of thousands of graduates, renowned scientist Yang Zhenning and so on participated in the school anniversary activity, at the meeting President Hu Jintao has made the lecture, drove all teachers and schoo

April 24, 2011 Tsinghua University held a centennial celebration everywhere tens of thousands of graduating, renowned scientist Yang attended the celebration activities, meeting Hu Jintao delivered speeches, motivate all teachers and classmates for their dream and country future efforts.

Centennial was held on April 24, 2011 at Tsinghua University, tens of thousands of graduates at home and abroad, famous scientist Yang Chen-Ning, attended the celebration activity, meeting, Hu Jintao delivered a speech President, and motivate all teachers and students and strive for their dreams and