数学是书写宇宙的语言。
Mathematics is the language in which the universe is written.
煤炭不仅仅是一种商品,它是对美国未来的承诺。
Customer trust is hard to earn and easy to lose; never take it for granted.
插图不仅仅是装饰;它们是讲故事不可或缺的一部分。