The great ideological battles between liberalism and communism, or between democracy and authoritarianism, have been replaced by a general consensus on the desirability of liberal democracy.

追求数学知识是一段永无止境的旅程。

这些人很少不是死于自己的所长，所以说∶事业达到顶峰就难以持久。 

"Patterns are like frozen music waiting to be heard."

Rule of 7 in research. You can find out anything if you are willing to go seven levels. If the first source you ask doesn’t know， ask them who you should ask next， and so on down the line. If you are willing to go to the 7th source， you’ll almost always get your answer.