最有效的调试工具仍然是仔细的思考，再加上明智放置的打印语句。

The simplest drawings can often carry the deepest emotions.

In every problem, there is a hidden pattern waiting to be discovered, and it is our duty as mathematicians to uncover it.

煤炭开采的创新不仅仅是关于开采，而是更智能、更安全、对环境的影响更小。