(1) http://deic.uab.es/~iblanes/beamer_gallery/index_by_theme.html
只要把主题参数 按照这个网页的改一下 就可以换主题了。Qingyuan发给我的是Madrid。语句：\usetheme{Madrid}
(2) Putting a bibliography citation at bottom of beamer slide:
Method 1: Qingyuan suggests using vspsace.
Method 2: https://tex.stackexchange.com/questions/219982/putting-a-bibliography-citation-at-bottom-of-beamer-slide
\documentclass{beamer}
\usepackage{biblatex}
\begin{document}
\begin{frame}
Hello,World\footfullcite{Write something here, anything you like}
\end{frame}
\end{document}
(3) http://bbs.pinggu.org/thread-3985040-1-1.html
beamer 中文日期的显示
\renewcommand{\today}{\number\year 年\number\month 月\number\day 日}
\today
This is with Qingyuan Jiang's help.