commencement
n. 毕业典礼
eg. Before leaving I attended the 47th commencement of Cornell on June 16, 1914.
离校之前，我还在1914年6月16日参加了康乃尔的第47届毕业典礼。

podium
n. 讲台
eg. We're all anxious to hear Mrs. Zhuang Wei's remarks, so let us all welcome her to the podium.
我们都盼望听到庄薇女士说几句话，所以让我们欢迎她上台。

mega-billionaire
n. 超级富翁
eg. With the best will in the world you'll never become a billionaire．
就算使出浑身解数，你也成不了亿万富翁。

philanthropist
n. 慈善家
eg. The university was founded by a millionaire philanthropist.
这所大学的创建人是位腰缠万贯的慈善家。

nerd
n. 狂热爱好者；呆子
eg. A typical nerd is someone who wears glasses and carries a lot of books.
那就是典型的书呆子形象，戴着眼镜，拿着许多书。