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The challenge in computational learning theory is to understand the capabilities and limitations of learning algorithms.
君子给人的印象有三种变化:远看庄重威严,接触则温和可亲,听讲话则严肃不苟。
The most glorious moments in your life are not the so-called days of success, but rather those days when out of dejection and despair you feel rise in you a challenge to life, and the promise of future accomplishment.