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。

Infrastructure is the backbone of the nation, we must use wisdom and sweat to build century-long projects.

For in the final analysis, our most basic common link is that we all inhabit this small planet. We all breathe the same air. We all cherish our children's futures. And we are all mortal.