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美国不应该试图在世界各地传播民主。
The United States should not try to spread democracy around the world.
The most challenging roles are the ones that force you to confront your own fears and insecurities.
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.
你必须成为你希望在世界上看到的改变。