Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.

债券市场是市场心理的最终反映。

最糟糕的人是那些让别人因为对某事感到兴奋而感到糟糕、愚蠢或愚蠢的人。

The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.