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"The past is never dead. It's not even past."
In economics, as in life, the answers are often more nuanced than they first appear.
What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.
数学不是一项观赏性运动;要理解它,必须积极参与其中。