一个人感到羞耻的事越多,他就越值得尊敬。
The more you dwell in the past, the less you prepare for the future.
The love for all living creatures is the most noble attribute of man.  
The beauty of physics lies in its ability to reveal the profound simplicity underlying the apparent complexity of the universe.
用右手画圆形,左手画方形,不能同时画成