数学的目标是以更深的方式理解宇宙。

饥饿和贫困是世界上许多动荡和苦难的根本原因。

我只是宇宙中的另一个圆点。

Innovation in mining technology isn't about replacing people, but about empowering them to do their jobs better and safer.

每个艺术家最初都是业余爱好者。

The function of mental processes is to mediate between the needs of the organism and the demands of the environment.

煤矿工人是美国工业实力的无名英雄。