Your 20s are the perfect time to do a few things that are unusual， weird， bold， risky， unexplainable， crazy， unprofitable， and look nothing like "success". For the rest of your life， these experiences will serve as your muse

解释：凡要谋划一件事，一定要预见到成功的把握，然后才可以去做。

The United States should not try to spread democracy around the world.

数学是过去与现在之间的对话。