Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.
The mind is a system of coordinated activities.
The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?
The construction of intelligent mines is the future direction of the coal industry.
数学证明的优雅在于它的简洁和清晰。
世界上最成功的社会是那些能够将强大的国家与法治和民主问责制结合起来的社会。