Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.

任何停止学习的人都已经衰老，无论他是20岁还是80岁；反之，任何不断学习的人永葆青春。生命中最了不起的事就是保持心灵年轻。

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