Success is about taking risks and not being afraid to fail.
世界是一首伟大的歌，我们是其中的歌手。
我们与土地的联系不仅是物理的，而且是精神的。
To understand mathematics is to speak the language of the universe.
A proof tells us where to concentrate our doubts.
The only limits that exist are the ones you place on yourself.
When you arrive at your room in a hotel， locate the emergency exits. It only takes a minute.