对心灵的研究就是对适应行为的研究。

The first step in the art of cutting metals is to find a man who has the necessary skill and experience.

"The only thing that one really knows about human nature is that it changes."

The future belongs to those who dare to dream and take action.

The world is full of mysteries, and that is its beauty.

Art doesn’t have to be serious to be meaningful.

煤炭的未来在于清洁高效利用。