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The best discoveries are those that raise more questions than they answer.
最好的发现是那些提出的问题比它们回答的还要多的发现。
谁知旧日情,斯人知太深。绵绵长怀恨,尽在不言中。
The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
Work spares us from three evils: boredom, vice, and need.