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Hunger and poverty are the root causes of much of the world's unrest and misery.
如果你想飞翔,就必须放弃那些拖累你的事物。
有些人特别善于了解自己的知识极限,因为他们必须这样做。
The key to solving complex problems is often to find the right abstraction that simplifies the problem without losing its essential features.