"The past is a ghost that haunts the present, whether we acknowledge it or not."

Success comes from persistence and hard work.

After the storm, the sky is clearer.

计算学习理论中的挑战在于理解学习算法的能力和局限性。

【释义】玉的瑕疵掩盖不了它的光泽，玉的光泽也掩盖不了它的瑕疵。