\TITLE{\LaTeX{} Thesis Template\\ of \\ The University of Chinese Academy of Sciences {$~^{\pi}\pi^{\pi}$}}% 论文英文题目

One important incompatibility with braces and macro replacement: All the text in braces or coming 

from a macro is typeset in a box (as if in \mbox). Consequently, braces will suppress stretching and 

line-breaking in the text they enclose. Moreover, the specially-handled commands \-, \\, \newline and 

\linebreak are usually ignored if they appear inside extra braces. They operate only when the braces 

delimit a command parameter without introducing a level of grouping. (Even though braces delimiting 

command parameters do not normally imply grouping, many commands will add their own grouping.) 

Thus, you should try to limit inner braces to short bits of text or for delimiting parameters to 

commands.