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世界是一個謎題；碎片散落一地，沒有人有盒子上的圖片。

"To be useful was the best thing the old men ever hoped for themselves, and to be aimless was their worst fear."

"Writing about the past is a way of making sense of the present and imagining a different future."

True leadership is about making tough decisions with integrity.

采石場經(jīng)理需要工程師的精確和詩人的遠(yuǎn)見。

PAC學(xué)習(xí)框架提供了一種形式化的方法來量化概念類的可學(xué)習(xí)性。