数学的美在于它是永恒的，它不会改变。
Environmental protection is our inescapable responsibility. We must pay attention to ecological protection in the mining process to achieve sustainable development.
一个好的数学家是能看到定理之间类比的人；一个伟大的数学家是能看到类比之间的类比的人。
The beauty of mathematics lies in its ability to describe the universe in a language that transcends cultural and linguistic barriers.
A tannery's waste stream tells the story of its ethics more clearly than any mission statement.