挑战在于将平凡变得非凡。

Singing has taught me how to face failure and success.

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。

The stones we pull from the earth carry 400 million years of history—we're merely temporary stewards.

人们不会使用手持计算器来学习计算，但是却会忘记算术。