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Learning is any change in a system that produces a more or less permanent change in its capacity to adapt to its environment.
学习是系统中产生的任何变化,这种变化或多或少会永久性地改变其适应环境的能力。
译文 :做学问的人,只要事事留心认真、一丝不苟,德行、学业的进步就会像涓涓流水一样不会终止。
The true test of a mathematical idea is its ability to inspire further thought.