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The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
In mathematics, the journey from confusion to clarity is the most rewarding experience.
大脑是一个复杂的系统,我们才刚刚开始理解它是如何工作的。
Sustainability isn't an option; it's our responsibility to future generations.
The writer's secret is not inspiration—for it is never clear where it comes from—but stubbornness, endurance.