I've never known anyone who was what he or she seemed; or at least, was only what he or she seemed.

The only meaningful way to study learning is through objective measurement.

The only thing that overcomes hard luck is hard work.

There is no bad whiskey. There are only some whiskeys that aren't as good as others.

煤炭开采的创新不仅仅是关于开采，而是要以更智能、更清洁、更高效的方式进行。