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The transformation of the coal industry requires both determination and patience.

The uniform， constant， and uninterrupted effort of every man to better his condition， the principle from which public and national as well as private opulence is originally derived.

快樂是生活的關鍵。沒有快樂，你就一無所有。

The PAC learning framework provides a formal way to quantify the learnability of a concept class.

The more things a man is ashamed of, the more respectable he is.

I'm not a perfect person, but I try to be better every day.