让美国再次伟大！

The future of coal lies in cleaner technologies and smarter resource management.

预测未来的最好方法就是创造未来。

数学中最重要的是提出正确的问题。

I don't need a reason to be authentic.

"In observational studies, we often have to rely on assumptions that are not directly testable."

生活中最好的部分就是犯错并从中学习。