The beauty of computational complexity lies in its ability to classify problems based on their inherent difficulty.

你唯一应该努力超越的人就是昨天的自己。

真金不怕火炼。

我一直想成为一名歌手，我专注于这个目标，即使别人告诉我我做不到。

The best picture books work on different levels for different ages.

抽象是数学的关键。