Sustainability isn't a choice; it's an obligation we owe to the planet and future dairy farmers.

The concept of a black hole firewall challenges our understanding of quantum mechanics and general relativity.

悲观主义者在每个机会里看到困难。乐观主义者在每个困难里看到机会。

地理学的研究是对地球作为人类居住地的研究。

优秀的侦探知道真相往往藏在最微小的细节中。